Supporting information
Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536807038330/cf2128sup1.cif | |
Structure factor file (CIF format) https://doi.org/10.1107/S1600536807038330/cf2128Isup2.hkl |
CCDC reference: 660245
Selective acetylation of 2',3'-O-isopropylideneguanosine employing a combination of acetic anhydride and recyclable 13X molecular sieves under heterogeneous conditions gave (I) in high purity (81% yield) according to the reported method (Sá & Meier, 2006). Slow crystallization from CH2Cl2/AcOEt/MeOH/hexane (1:18:2:1) furnished single crystals (mp 397–398 K), allowing structural elucidation by X-ray crystallographic technique. The absolute configuration for (I) was previously assigned based on 1H– and 13C-NMR shifts for the starting 2',3'-O-isopropylideneguanosine and on the homogeneity of the reaction product; in the absence of significant anomalous scattering, Friedel pairs were merged.
H atoms attached to carbon atoms were positioned geometrically, with C—H = 0.96 (CH3), 0.97 (CH2) or 0.93 Å (CHAr), and Uiso(H) = 1.2Ueq(C) or 1.5Ueq(C) for methyl groups. H atoms attached to N atoms were found in a difference Fourier map and refined freely. H atoms of the water molecules were also found in the difference map and treated as riding, with Uiso(H) = 1.2Ueq(O).
Nucleosides and synthetically modified analogues participate in a variety of physiological processes (De Clercq & Field, 2006; Santaniello et al., 2005) and are known to self-associate via hydrogen bonding and base stacking (Shi et al., 2001). In particular, 2',3'-O-isopropylideneguanosine and derivatives are notable for their propensity to aggregate (Shi et al., 2003; Mande et al., 1988; Mande et al., 1989). However, the crystal structures of N2-acetylated guanosines have not been reported so far. In continuation of our research on the chemistry of nucleosides (Sá et al., 2002; Leitão et al., 2004), we recently developed a simple and inexpensive method for the synthesis of 2',3'-O-isopropylidene-2-N-5'-O-diacetylguanosine (I) in good yield and high purity (Sá & Meier, 2006). We now report the crystal structure of this compound.
The asymmetric unit consists of two independent molecules of (I) (Fig. 1) and two molecules of water. Distinct intermolecular interactions (Table 2) and different conformational parameters (Table 1) between the independent molecules of (I) lead the asymmetric unit to be greater than expected. A similar feature was also observed in the crystal structure of 2',3'-O-isopropylideneguanosine (II) reported by Mande et al. (1989).
Bond lengths and angles are within the expected ranges (Allen et al., 1987). Both molecules of (I) show R configuration for their chiral centers C1', C2', C3' and C4' in molecule A and C11', C12', C13' and C14' in molecule B. In molecule A the furanose ring adopts envelope conformation on C3' (pucker C3'-exo), where this atom is 0.421 (5) Å out of the least-squares plane defined by the remaining four atoms, with pseudorotation parameters P and τm of 20.6 (5)° and 27.6 (2)°. The dioxolane ring is twisted on O2—C2' bond and exhibits C30-exo–O2-endo type pucker with P = 112.7 (4)° and τm = 35.6 (2)°. Molecule B also shows the furanose ring as an envelope on C14' (pucker C14'-exo) with P = 233.3 (4)° and τm = 30.6 (2)°, where C14' is displaced of 0.431 (5) Å from the mean plane formed by the four other atoms. The dioxolane ring is twisted on C13'—O13 and exhibits C130-exo–O13-endo pucker type with pseudorotation parameters P = 355.8 (5)° and τm = 26.3 (2)°. In the N-acetylated groups, the conformation about the C4'—C5' bond is gauche–gauche with ΦOC = 50.2 (5)° and ΦOO = -69.7 (4)° for molecule A and about the C14'—C15' bond it is gauche-anti with ΦOC = -75.4 (4)° and ΦOO = 168.7 (3)° for molecule B. Similar conformations for these groups found in molecule A were reported for the crystal structure of compound (II) crystallized from Me2SO by Mande et al. (1988), but they are significantly different from those determined for (II) crystallized from water/acetone (Mande et al., 1989), where in both molecules the furanose rings are C1'-endo, the conformation around C4'—C5' bonds is anti–gauche and the dioxolane ring in molecule A (II) is C9-endo–O3'-exo.
The purine groups are essentially planar, but the deviation from planarity is slightly different in each independent molecule of (I). The r.m.s. deviations of 10 fitted atoms are 0.005 and 0.020 for molecules A and B, respectively. Despite the N—H···O intramolecular hydrogen bond (Table 2), the torsion angles N3—C2—N21—C22 of -179.0 (3)° and N13—C12—N121—C122 of 175.0 (3)° demonstrate that the terminal amide arms deviate distinctly from the correspondent purine mean plane, while the exocyclic O6 and O16 atoms are retained in their respective planes. The conformation of the nucleoside group is anti with torsion angles O1—C1'—N9—C4 of -140.1 (3)° [A] and O11—C11'—N19—C14 of -178.9 (3)° [B]. These values are significantly different from those found in compound (II), with torsion angles of -94.1° (Mande et al., 1988) and 74.1° and 77.5° (Mande et al., 1989).
The purine groups of molecules A and B are almost parallel, with a dihedral angles between their mean planes of 4.90 (2)°. The molecules are stacked in the [010] direction, with intercalated A and B molecules. In addition, a very interesting packing take place through intermolecular interactions (Fig. 2). The water molecule O1W links A molecules and the water molecule O2W links B molecules, forming an infinite chain, also along the crystallographic b axis. The O2W—H2WB···O1W hydrogen bond between water molecules connects the two chains, thus building a double-sheet polymeric structure.
For related literature, see: Allen et al. (1987); De Clercq & Field (2006); Mande et al. (1988, 1989); Sá & Meier (2006); Sá et al. (2002); Santaniello et al. (2005); Shi et al. (2001, 2003); Leitão et al. (2004).
Data collection: CAD-4 EXPRESS (Enraf–Nonius, 1994); cell refinement: SET4 in CAD-4 EXPRESS; data reduction: HELENA (Spek, 1996); program(s) used to solve structure: SIR97 (Altomare et al., 1999); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: PLATON (Spek, 2003) and Mercury (Macrae et al., 2006); software used to prepare material for publication: SHELXL97.
C17H21N5O7·H2O | Z = 2 |
Mr = 425.40 | F(000) = 448 |
Triclinic, P1 | Dx = 1.429 Mg m−3 |
Hall symbol: P 1 | Mo Kα radiation, λ = 0.71069 Å |
a = 6.595 (1) Å | Cell parameters from 25 reflections |
b = 9.688 (1) Å | θ = 5.1–18.8° |
c = 16.301 (1) Å | µ = 0.12 mm−1 |
α = 72.72 (1)° | T = 293 K |
β = 89.68 (1)° | Prismatic, colourless |
γ = 83.82 (1)° | 0.50 × 0.23 × 0.16 mm |
V = 988.34 (19) Å3 |
Enraf–Nonius CAD-4 diffractometer | Rint = 0.017 |
Radiation source: fine-focus sealed tube | θmax = 30.4°, θmin = 1.3° |
Graphite monochromator | h = −9→9 |
ω/2θ scans | k = −13→13 |
6620 measured reflections | l = −22→14 |
5699 independent reflections | 3 standard reflections every 200 reflections |
4093 reflections with I > 2σ(I) | intensity decay: <1% |
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.050 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.148 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.03 | w = 1/[σ2(Fo2) + (0.0786P)2 + 0.2093P] where P = (Fo2 + 2Fc2)/3 |
5699 reflections | (Δ/σ)max < 0.001 |
557 parameters | Δρmax = 0.37 e Å−3 |
3 restraints | Δρmin = −0.24 e Å−3 |
C17H21N5O7·H2O | γ = 83.82 (1)° |
Mr = 425.40 | V = 988.34 (19) Å3 |
Triclinic, P1 | Z = 2 |
a = 6.595 (1) Å | Mo Kα radiation |
b = 9.688 (1) Å | µ = 0.12 mm−1 |
c = 16.301 (1) Å | T = 293 K |
α = 72.72 (1)° | 0.50 × 0.23 × 0.16 mm |
β = 89.68 (1)° |
Enraf–Nonius CAD-4 diffractometer | Rint = 0.017 |
6620 measured reflections | 3 standard reflections every 200 reflections |
5699 independent reflections | intensity decay: <1% |
4093 reflections with I > 2σ(I) |
R[F2 > 2σ(F2)] = 0.050 | 3 restraints |
wR(F2) = 0.148 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.03 | Δρmax = 0.37 e Å−3 |
5699 reflections | Δρmin = −0.24 e Å−3 |
557 parameters |
x | y | z | Uiso*/Ueq | ||
N1 | 0.5489 (4) | 0.9264 (3) | 0.7783 (2) | 0.0340 (6) | |
C2 | 0.5637 (5) | 0.9965 (3) | 0.8396 (2) | 0.0330 (6) | |
N3 | 0.5925 (4) | 0.9319 (3) | 0.92166 (18) | 0.0333 (5) | |
C4 | 0.6092 (5) | 0.7851 (3) | 0.9397 (2) | 0.0308 (6) | |
C5 | 0.5969 (5) | 0.7023 (3) | 0.8842 (2) | 0.0315 (6) | |
C6 | 0.5635 (4) | 0.7744 (3) | 0.7943 (2) | 0.0326 (6) | |
O6 | 0.5481 (4) | 0.7239 (3) | 0.73424 (16) | 0.0429 (6) | |
N7 | 0.6223 (4) | 0.5549 (3) | 0.9301 (2) | 0.0379 (6) | |
C8 | 0.6499 (6) | 0.5519 (4) | 1.0101 (2) | 0.0396 (7) | |
H8 | 0.6718 | 0.4663 | 1.0554 | 0.048* | |
N9 | 0.6430 (4) | 0.6879 (3) | 1.02033 (18) | 0.0356 (6) | |
C1' | 0.6706 (5) | 0.7256 (3) | 1.0993 (2) | 0.0378 (7) | |
H1' | 0.7105 | 0.8243 | 1.0857 | 0.045* | |
C2' | 0.4813 (6) | 0.7141 (3) | 1.1521 (2) | 0.0390 (7) | |
H2' | 0.3563 | 0.7205 | 1.1183 | 0.047* | |
C3' | 0.5225 (6) | 0.5712 (4) | 1.2242 (2) | 0.0440 (8) | |
H3' | 0.4681 | 0.4908 | 1.2098 | 0.053* | |
O1 | 0.8251 (4) | 0.6254 (3) | 1.14928 (18) | 0.0489 (6) | |
O2 | 0.4720 (5) | 0.8171 (3) | 1.19937 (16) | 0.0483 (6) | |
O3 | 0.4292 (5) | 0.5984 (3) | 1.29675 (19) | 0.0618 (8) | |
C4' | 0.7534 (6) | 0.5496 (4) | 1.2324 (2) | 0.0451 (8) | |
H4' | 0.7951 | 0.5973 | 1.2739 | 0.054* | |
C5' | 0.8544 (7) | 0.3959 (4) | 1.2589 (3) | 0.0569 (10) | |
H5'1 | 1.0008 | 0.3949 | 1.2527 | 0.068* | |
H5'2 | 0.8273 | 0.3479 | 1.3186 | 0.068* | |
N21 | 0.5468 (5) | 1.1468 (3) | 0.8130 (2) | 0.0399 (6) | |
C22 | 0.5137 (6) | 1.2358 (4) | 0.7312 (3) | 0.0465 (8) | |
O22 | 0.4858 (6) | 1.1924 (3) | 0.6696 (2) | 0.0707 (10) | |
C23 | 0.5148 (8) | 1.3962 (4) | 0.7225 (3) | 0.0566 (10) | |
H23A | 0.5388 | 1.4077 | 0.7780 | 0.085* | |
H23B | 0.3853 | 1.4477 | 0.6992 | 0.085* | |
H23C | 0.6209 | 1.4345 | 0.6847 | 0.085* | |
C30 | 0.3801 (7) | 0.7531 (4) | 1.2793 (3) | 0.0522 (9) | |
C31 | 0.1567 (9) | 0.7868 (7) | 1.2703 (4) | 0.0769 (14) | |
H31A | 0.1211 | 0.8896 | 1.2587 | 0.115* | |
H31B | 0.0954 | 0.7361 | 1.3226 | 0.115* | |
H31C | 0.1079 | 0.7564 | 1.2237 | 0.115* | |
C32 | 0.4768 (12) | 0.8041 (8) | 1.3469 (4) | 0.0900 (19) | |
H32A | 0.4431 | 0.9072 | 1.3345 | 0.135* | |
H32B | 0.6222 | 0.7819 | 1.3471 | 0.135* | |
H32C | 0.4267 | 0.7556 | 1.4022 | 0.135* | |
O51 | 0.7718 (5) | 0.3217 (3) | 1.20395 (19) | 0.0544 (7) | |
C52 | 0.8204 (8) | 0.1780 (5) | 1.2249 (3) | 0.0665 (12) | |
O52 | 0.9266 (10) | 0.1129 (5) | 1.2856 (4) | 0.132 (2) | |
C53 | 0.7288 (11) | 0.1140 (6) | 1.1641 (4) | 0.0841 (17) | |
H53A | 0.6539 | 0.1898 | 1.1194 | 0.126* | |
H53B | 0.6381 | 0.0460 | 1.1941 | 0.126* | |
H53C | 0.8348 | 0.0646 | 1.1392 | 0.126* | |
N11 | 0.1225 (4) | 0.6227 (3) | 0.9599 (2) | 0.0398 (6) | |
C12 | 0.1310 (5) | 0.5385 (4) | 0.9062 (2) | 0.0363 (7) | |
N13 | 0.1113 (4) | 0.5873 (3) | 0.82256 (18) | 0.0355 (6) | |
C14 | 0.0864 (5) | 0.7348 (3) | 0.7941 (2) | 0.0320 (6) | |
C15 | 0.0782 (5) | 0.8324 (4) | 0.8417 (2) | 0.0351 (7) | |
C16 | 0.0982 (5) | 0.7765 (4) | 0.9338 (2) | 0.0390 (7) | |
O16 | 0.1000 (4) | 0.8424 (3) | 0.98721 (18) | 0.0520 (7) | |
N17 | 0.0603 (4) | 0.9738 (3) | 0.7872 (2) | 0.0406 (6) | |
C18 | 0.0581 (5) | 0.9593 (4) | 0.7106 (3) | 0.0414 (8) | |
H18 | 0.0497 | 1.0378 | 0.6608 | 0.050* | |
N19 | 0.0694 (4) | 0.8164 (3) | 0.70972 (18) | 0.0354 (6) | |
C11' | 0.0976 (5) | 0.7588 (4) | 0.6352 (2) | 0.0372 (7) | |
H11' | 0.2361 | 0.7093 | 0.6380 | 0.045* | |
C12' | −0.0567 (5) | 0.6523 (4) | 0.6323 (2) | 0.0377 (7) | |
H12' | −0.1515 | 0.6411 | 0.6797 | 0.045* | |
O11 | 0.0717 (4) | 0.8759 (3) | 0.55897 (17) | 0.0497 (6) | |
O12 | 0.0358 (5) | 0.5154 (3) | 0.62789 (18) | 0.0500 (6) | |
O13 | −0.0623 (6) | 0.6514 (4) | 0.4896 (2) | 0.0706 (10) | |
C13' | −0.1672 (6) | 0.7242 (4) | 0.5448 (2) | 0.0471 (8) | |
H13' | −0.3136 | 0.7144 | 0.5468 | 0.057* | |
C14' | −0.1235 (6) | 0.8797 (4) | 0.5190 (2) | 0.0465 (8) | |
H14' | −0.1148 | 0.9166 | 0.4564 | 0.056* | |
C15' | −0.2766 (7) | 0.9774 (5) | 0.5506 (3) | 0.0571 (10) | |
H15A | −0.3037 | 0.9310 | 0.6104 | 0.069* | |
H15B | −0.2215 | 1.0679 | 0.5465 | 0.069* | |
N121 | 0.1636 (5) | 0.3876 (3) | 0.9412 (2) | 0.0449 (7) | |
C122 | 0.2035 (6) | 0.3085 (5) | 1.0258 (3) | 0.0527 (9) | |
O122 | 0.2148 (6) | 0.3671 (4) | 1.0822 (2) | 0.0726 (9) | |
C123 | 0.2362 (9) | 0.1468 (5) | 1.0408 (4) | 0.0713 (14) | |
H12A | 0.2212 | 0.1261 | 0.9873 | 0.107* | |
H12B | 0.1374 | 0.1010 | 1.0802 | 0.107* | |
H12C | 0.3710 | 0.1101 | 1.0647 | 0.107* | |
C130 | 0.0215 (7) | 0.5106 (4) | 0.5404 (3) | 0.0501 (9) | |
C131 | −0.1049 (13) | 0.3942 (8) | 0.5376 (4) | 0.095 (2) | |
H13A | −0.0414 | 0.3021 | 0.5732 | 0.142* | |
H13B | −0.1169 | 0.3913 | 0.4795 | 0.142* | |
H13C | −0.2381 | 0.4138 | 0.5584 | 0.142* | |
C132 | 0.2314 (10) | 0.4863 (8) | 0.5091 (4) | 0.0876 (19) | |
H13D | 0.2943 | 0.3919 | 0.5415 | 0.131* | |
H13E | 0.3111 | 0.5594 | 0.5163 | 0.131* | |
H13F | 0.2240 | 0.4921 | 0.4493 | 0.131* | |
O151 | −0.4605 (5) | 1.0066 (4) | 0.5013 (3) | 0.0728 (10) | |
C152 | −0.4991 (9) | 1.1363 (6) | 0.4447 (4) | 0.0708 (13) | |
O152 | −0.3852 (10) | 1.2225 (6) | 0.4326 (4) | 0.137 (2) | |
C153 | −0.7059 (10) | 1.1552 (8) | 0.4044 (5) | 0.103 (2) | |
H15C | −0.7699 | 1.0678 | 0.4272 | 0.155* | |
H15D | −0.6945 | 1.1752 | 0.3433 | 0.155* | |
H15E | −0.7869 | 1.2349 | 0.4165 | 0.155* | |
O1W | 0.6997 (5) | 0.2679 (3) | 0.9295 (2) | 0.0657 (9) | |
H1WA | 0.6671 | 0.3556 | 0.9329 | 0.079* | |
H1WB | 0.7369 | 0.2105 | 0.9797 | 0.079* | |
O2W | 0.0482 (5) | 1.2583 (4) | 0.8105 (2) | 0.0660 (9) | |
H2WA | 0.0698 | 1.1624 | 0.8136 | 0.079* | |
H2WB | −0.0548 | 1.2723 | 0.8414 | 0.079* | |
H1 | 0.530 (8) | 0.980 (6) | 0.733 (4) | 0.064 (15)* | |
H11 | 0.138 (7) | 0.576 (5) | 1.016 (3) | 0.055 (13)* | |
H21 | 0.580 (6) | 1.182 (4) | 0.855 (3) | 0.030 (9)* | |
H121 | 0.143 (7) | 0.339 (5) | 0.900 (3) | 0.048 (11)* |
U11 | U22 | U33 | U12 | U13 | U23 | |
N1 | 0.0362 (14) | 0.0316 (13) | 0.0335 (14) | −0.0039 (10) | 0.0007 (11) | −0.0084 (11) |
C2 | 0.0310 (15) | 0.0286 (14) | 0.0392 (17) | −0.0024 (11) | 0.0035 (12) | −0.0104 (12) |
N3 | 0.0397 (14) | 0.0246 (12) | 0.0364 (14) | −0.0035 (10) | 0.0030 (11) | −0.0101 (10) |
C4 | 0.0308 (14) | 0.0284 (14) | 0.0322 (15) | −0.0041 (11) | 0.0031 (11) | −0.0073 (12) |
C5 | 0.0302 (14) | 0.0261 (13) | 0.0400 (17) | −0.0039 (11) | 0.0040 (12) | −0.0124 (12) |
C6 | 0.0251 (14) | 0.0344 (15) | 0.0431 (17) | −0.0075 (11) | 0.0077 (12) | −0.0174 (13) |
O6 | 0.0470 (14) | 0.0453 (14) | 0.0432 (13) | −0.0093 (11) | 0.0034 (11) | −0.0221 (11) |
N7 | 0.0407 (15) | 0.0271 (13) | 0.0470 (16) | −0.0048 (11) | 0.0042 (12) | −0.0125 (11) |
C8 | 0.0500 (19) | 0.0263 (14) | 0.0424 (18) | −0.0051 (13) | 0.0020 (14) | −0.0097 (13) |
N9 | 0.0416 (15) | 0.0255 (12) | 0.0392 (14) | −0.0040 (10) | −0.0011 (11) | −0.0089 (11) |
C1' | 0.0502 (19) | 0.0277 (14) | 0.0358 (16) | −0.0042 (13) | −0.0027 (14) | −0.0098 (12) |
C2' | 0.0484 (19) | 0.0326 (16) | 0.0369 (16) | −0.0014 (13) | −0.0012 (14) | −0.0129 (13) |
C3' | 0.057 (2) | 0.0300 (15) | 0.0421 (18) | −0.0052 (14) | 0.0023 (15) | −0.0058 (13) |
O1 | 0.0426 (14) | 0.0517 (15) | 0.0448 (14) | −0.0016 (11) | −0.0063 (11) | −0.0041 (12) |
O2 | 0.0747 (18) | 0.0322 (12) | 0.0386 (13) | −0.0031 (11) | 0.0055 (12) | −0.0127 (10) |
O3 | 0.085 (2) | 0.0449 (15) | 0.0465 (16) | 0.0003 (14) | 0.0218 (15) | −0.0028 (12) |
C4' | 0.058 (2) | 0.0336 (17) | 0.0380 (18) | −0.0025 (15) | −0.0061 (15) | −0.0031 (14) |
C5' | 0.068 (3) | 0.0399 (19) | 0.057 (2) | 0.0066 (18) | −0.020 (2) | −0.0088 (18) |
N21 | 0.0509 (17) | 0.0262 (13) | 0.0405 (16) | −0.0023 (11) | −0.0030 (13) | −0.0075 (11) |
C22 | 0.059 (2) | 0.0296 (16) | 0.046 (2) | −0.0009 (15) | 0.0001 (16) | −0.0057 (14) |
O22 | 0.116 (3) | 0.0435 (16) | 0.0472 (17) | −0.0018 (17) | −0.0089 (17) | −0.0079 (13) |
C23 | 0.076 (3) | 0.0267 (17) | 0.059 (2) | −0.0025 (17) | 0.000 (2) | −0.0010 (16) |
C30 | 0.076 (3) | 0.0427 (19) | 0.0384 (19) | −0.0026 (18) | 0.0052 (18) | −0.0136 (15) |
C31 | 0.073 (3) | 0.077 (3) | 0.074 (3) | 0.010 (3) | 0.010 (3) | −0.018 (3) |
C32 | 0.124 (5) | 0.109 (5) | 0.053 (3) | −0.026 (4) | 0.006 (3) | −0.042 (3) |
O51 | 0.0637 (17) | 0.0370 (13) | 0.0571 (17) | 0.0050 (12) | −0.0174 (13) | −0.0090 (12) |
C52 | 0.080 (3) | 0.042 (2) | 0.072 (3) | 0.009 (2) | −0.016 (2) | −0.012 (2) |
O52 | 0.190 (5) | 0.053 (2) | 0.140 (4) | 0.045 (3) | −0.102 (4) | −0.030 (2) |
C53 | 0.105 (4) | 0.051 (3) | 0.096 (4) | −0.009 (3) | −0.027 (3) | −0.020 (3) |
N11 | 0.0390 (15) | 0.0443 (16) | 0.0367 (16) | −0.0083 (12) | 0.0010 (12) | −0.0116 (13) |
C12 | 0.0315 (16) | 0.0342 (16) | 0.0421 (17) | −0.0051 (12) | 0.0006 (13) | −0.0093 (13) |
N13 | 0.0404 (14) | 0.0310 (13) | 0.0368 (14) | −0.0057 (11) | −0.0001 (11) | −0.0121 (11) |
C14 | 0.0284 (14) | 0.0332 (15) | 0.0356 (16) | −0.0027 (11) | 0.0016 (12) | −0.0124 (12) |
C15 | 0.0287 (15) | 0.0352 (16) | 0.0442 (18) | −0.0055 (12) | 0.0005 (13) | −0.0157 (13) |
C16 | 0.0292 (15) | 0.0450 (19) | 0.0477 (19) | −0.0066 (13) | 0.0014 (13) | −0.0206 (15) |
O16 | 0.0605 (17) | 0.0562 (16) | 0.0483 (15) | −0.0084 (13) | −0.0015 (13) | −0.0286 (13) |
N17 | 0.0382 (15) | 0.0339 (14) | 0.0525 (18) | −0.0047 (11) | −0.0045 (13) | −0.0169 (13) |
C18 | 0.0431 (18) | 0.0304 (16) | 0.049 (2) | −0.0032 (13) | −0.0052 (15) | −0.0090 (14) |
N19 | 0.0372 (14) | 0.0308 (13) | 0.0381 (14) | −0.0028 (10) | −0.0033 (11) | −0.0103 (11) |
C11' | 0.0388 (17) | 0.0360 (16) | 0.0355 (16) | −0.0008 (13) | 0.0008 (13) | −0.0099 (13) |
C12' | 0.0409 (17) | 0.0377 (16) | 0.0393 (17) | −0.0041 (13) | 0.0014 (13) | −0.0188 (14) |
O11 | 0.0519 (15) | 0.0558 (16) | 0.0373 (13) | −0.0144 (12) | −0.0004 (11) | −0.0048 (11) |
O12 | 0.0701 (18) | 0.0383 (13) | 0.0432 (14) | 0.0071 (12) | −0.0075 (12) | −0.0191 (11) |
O13 | 0.106 (3) | 0.0621 (19) | 0.0417 (15) | 0.0282 (18) | −0.0193 (16) | −0.0249 (14) |
C13' | 0.049 (2) | 0.050 (2) | 0.0450 (19) | 0.0072 (15) | −0.0116 (16) | −0.0230 (17) |
C14' | 0.053 (2) | 0.049 (2) | 0.0337 (17) | 0.0011 (16) | −0.0068 (15) | −0.0089 (15) |
C15' | 0.067 (3) | 0.048 (2) | 0.054 (2) | 0.0102 (19) | −0.016 (2) | −0.0175 (18) |
N121 | 0.0481 (17) | 0.0351 (15) | 0.0480 (17) | −0.0066 (12) | −0.0029 (13) | −0.0065 (13) |
C122 | 0.053 (2) | 0.047 (2) | 0.049 (2) | −0.0040 (17) | −0.0011 (17) | −0.0008 (18) |
O122 | 0.096 (3) | 0.063 (2) | 0.0476 (18) | −0.0009 (18) | −0.0051 (16) | −0.0019 (15) |
C123 | 0.075 (3) | 0.048 (2) | 0.074 (3) | −0.001 (2) | −0.008 (2) | 0.005 (2) |
C130 | 0.072 (3) | 0.0396 (18) | 0.0404 (19) | 0.0042 (17) | −0.0028 (17) | −0.0183 (15) |
C131 | 0.139 (6) | 0.091 (4) | 0.072 (4) | −0.048 (4) | −0.008 (4) | −0.039 (3) |
C132 | 0.088 (4) | 0.105 (5) | 0.055 (3) | 0.016 (3) | 0.017 (3) | −0.011 (3) |
O151 | 0.0605 (19) | 0.0502 (18) | 0.107 (3) | 0.0030 (14) | −0.0225 (19) | −0.0259 (18) |
C152 | 0.075 (3) | 0.060 (3) | 0.072 (3) | 0.006 (2) | −0.017 (3) | −0.016 (2) |
O152 | 0.134 (5) | 0.103 (4) | 0.130 (5) | −0.037 (4) | −0.036 (4) | 0.043 (3) |
C153 | 0.086 (4) | 0.105 (5) | 0.119 (6) | 0.038 (4) | −0.052 (4) | −0.048 (4) |
O1W | 0.092 (2) | 0.0366 (14) | 0.074 (2) | −0.0037 (14) | −0.0163 (17) | −0.0247 (14) |
O2W | 0.071 (2) | 0.0555 (18) | 0.085 (2) | −0.0057 (15) | 0.0044 (17) | −0.0409 (17) |
N1—C2 | 1.373 (4) | N11—H11 | 0.89 (5) |
N1—C6 | 1.410 (4) | C12—N13 | 1.306 (5) |
N1—H1 | 0.77 (6) | C12—N121 | 1.396 (4) |
C2—N3 | 1.303 (4) | N13—C14 | 1.357 (4) |
C2—N21 | 1.383 (4) | C14—N19 | 1.366 (4) |
N3—C4 | 1.356 (4) | C14—C15 | 1.387 (4) |
C4—N9 | 1.374 (4) | C15—N17 | 1.387 (5) |
C4—C5 | 1.383 (4) | C15—C16 | 1.437 (5) |
C5—N7 | 1.393 (4) | C16—O16 | 1.224 (4) |
C5—C6 | 1.431 (5) | N17—C18 | 1.299 (5) |
C6—O6 | 1.227 (4) | C18—N19 | 1.383 (4) |
N7—C8 | 1.310 (5) | C18—H18 | 0.930 |
C8—N9 | 1.373 (4) | N19—C11' | 1.483 (4) |
C8—H8 | 0.930 | C11'—O11 | 1.408 (4) |
N9—C1' | 1.455 (4) | C11'—C12' | 1.536 (5) |
C1'—O1 | 1.404 (4) | C11'—H11' | 0.980 |
C1'—C2' | 1.508 (5) | C12'—O12 | 1.420 (4) |
C1'—H1' | 0.980 | C12'—C13' | 1.536 (5) |
C2'—O2 | 1.427 (4) | C12'—H12' | 0.980 |
C2'—C3' | 1.526 (5) | O11—C14' | 1.438 (5) |
C2'—H2' | 0.980 | O12—C130 | 1.445 (5) |
C3'—O3 | 1.410 (5) | O13—C130 | 1.423 (5) |
C3'—C4' | 1.516 (6) | O13—C13' | 1.432 (5) |
C3'—H3' | 0.980 | C13'—C14' | 1.498 (6) |
O1—C4' | 1.440 (5) | C13'—H13' | 0.980 |
O2—C30 | 1.429 (5) | C14'—C15' | 1.503 (6) |
O3—C30 | 1.441 (5) | C14'—H14' | 0.980 |
C4'—C5' | 1.502 (5) | C15'—O151 | 1.413 (5) |
C4'—H4' | 0.980 | C15'—H15A | 0.970 |
C5'—O51 | 1.445 (5) | C15'—H15B | 0.970 |
C5'—H5'1 | 0.970 | N121—C122 | 1.375 (5) |
C5'—H5'2 | 0.970 | N121—H121 | 0.95 (5) |
N21—C22 | 1.360 (5) | C122—O122 | 1.221 (6) |
N21—H21 | 0.89 (4) | C122—C123 | 1.503 (7) |
C22—O22 | 1.220 (5) | C123—H12A | 0.960 |
C22—C23 | 1.518 (5) | C123—H12B | 0.960 |
C23—H23A | 0.960 | C123—H12C | 0.960 |
C23—H23B | 0.960 | C130—C131 | 1.483 (7) |
C23—H23C | 0.960 | C130—C132 | 1.492 (7) |
C30—C31 | 1.473 (7) | C131—H13A | 0.960 |
C30—C32 | 1.504 (7) | C131—H13B | 0.960 |
C31—H31A | 0.960 | C131—H13C | 0.960 |
C31—H31B | 0.960 | C132—H13D | 0.960 |
C31—H31C | 0.960 | C132—H13E | 0.960 |
C32—H32A | 0.960 | C132—H13F | 0.960 |
C32—H32B | 0.960 | O151—C152 | 1.319 (6) |
C32—H32C | 0.960 | C152—O152 | 1.156 (8) |
O51—C52 | 1.334 (5) | C152—C153 | 1.487 (8) |
C52—O52 | 1.188 (6) | C153—H15C | 0.960 |
C52—C53 | 1.478 (8) | C153—H15D | 0.960 |
C53—H53A | 0.960 | C153—H15E | 0.960 |
C53—H53B | 0.960 | O1W—H1WA | 0.8719 |
C53—H53C | 0.960 | O1W—H1WB | 0.8614 |
N11—C12 | 1.359 (5) | O2W—H2WA | 0.9113 |
N11—C16 | 1.415 (5) | O2W—H2WB | 0.8654 |
C2—N1—C6 | 125.4 (3) | C12—N11—H11 | 117 (3) |
C2—N1—H1 | 113 (4) | C16—N11—H11 | 118 (3) |
C6—N1—H1 | 122 (4) | N13—C12—N11 | 125.1 (3) |
N3—C2—N1 | 124.9 (3) | N13—C12—N121 | 115.9 (3) |
N3—C2—N21 | 117.0 (3) | N11—C12—N121 | 118.9 (3) |
N1—C2—N21 | 118.1 (3) | C12—N13—C14 | 111.8 (3) |
C2—N3—C4 | 111.5 (3) | N13—C14—N19 | 125.0 (3) |
N3—C4—N9 | 125.0 (3) | N13—C14—C15 | 128.6 (3) |
N3—C4—C5 | 129.0 (3) | N19—C14—C15 | 106.4 (3) |
N9—C4—C5 | 106.0 (3) | N17—C15—C14 | 110.0 (3) |
C4—C5—N7 | 110.0 (3) | N17—C15—C16 | 131.2 (3) |
C4—C5—C6 | 119.0 (3) | C14—C15—C16 | 118.7 (3) |
N7—C5—C6 | 131.0 (3) | O16—C16—N11 | 120.3 (3) |
O6—C6—N1 | 119.7 (3) | O16—C16—C15 | 129.4 (3) |
O6—C6—C5 | 130.1 (3) | N11—C16—C15 | 110.3 (3) |
N1—C6—C5 | 110.2 (3) | C18—N17—C15 | 104.4 (3) |
C8—N7—C5 | 104.6 (3) | N17—C18—N19 | 113.9 (3) |
N7—C8—N9 | 113.1 (3) | N17—C18—H18 | 123.1 |
N7—C8—H8 | 123.5 | N19—C18—H18 | 123.1 |
N9—C8—H8 | 123.5 | C14—N19—C18 | 105.3 (3) |
C8—N9—C4 | 106.2 (3) | C14—N19—C11' | 125.4 (3) |
C8—N9—C1' | 128.1 (3) | C18—N19—C11' | 128.3 (3) |
C4—N9—C1' | 125.6 (3) | O11—C11'—N19 | 108.8 (3) |
O1—C1'—N9 | 107.8 (3) | O11—C11'—C12' | 108.1 (3) |
O1—C1'—C2' | 107.0 (3) | N19—C11'—C12' | 112.5 (3) |
N9—C1'—C2' | 112.3 (3) | O11—C11'—H11' | 109.1 |
O1—C1'—H1' | 109.9 | N19—C11'—H11' | 109.1 |
N9—C1'—H1' | 109.9 | C12'—C11'—H11' | 109.1 |
C2'—C1'—H1' | 109.9 | O12—C12'—C13' | 105.3 (3) |
O2—C2'—C1' | 109.5 (3) | O12—C12'—C11' | 113.5 (3) |
O2—C2'—C3' | 101.1 (3) | C13'—C12'—C11' | 103.0 (3) |
C1'—C2'—C3' | 105.4 (3) | O12—C12'—H12' | 111.5 |
O2—C2'—H2' | 113.3 | C13'—C12'—H12' | 111.5 |
C1'—C2'—H2' | 113.3 | C11'—C12'—H12' | 111.5 |
C3'—C2'—H2' | 113.3 | C11'—O11—C14' | 109.9 (3) |
O3—C3'—C4' | 112.9 (3) | C12'—O12—C130 | 109.2 (3) |
O3—C3'—C2' | 105.1 (3) | C130—O13—C13' | 108.6 (3) |
C4'—C3'—C2' | 102.7 (3) | O13—C13'—C14' | 109.4 (4) |
O3—C3'—H3' | 111.9 | O13—C13'—C12' | 103.2 (3) |
C4'—C3'—H3' | 111.9 | C14'—C13'—C12' | 105.6 (3) |
C2'—C3'—H3' | 111.9 | O13—C13'—H13' | 112.7 |
C1'—O1—C4' | 111.5 (3) | C14'—C13'—H13' | 112.7 |
C2'—O2—C30 | 107.3 (3) | C12'—C13'—H13' | 112.7 |
C3'—O3—C30 | 108.8 (3) | O11—C14'—C13' | 104.6 (3) |
O1—C4'—C5' | 108.8 (3) | O11—C14'—C15' | 108.5 (3) |
O1—C4'—C3' | 105.9 (3) | C13'—C14'—C15' | 113.5 (4) |
C5'—C4'—C3' | 117.2 (3) | O11—C14'—H14' | 110.0 |
O1—C4'—H4' | 108.2 | C13'—C14'—H14' | 110.0 |
C5'—C4'—H4' | 108.2 | C15'—C14'—H14' | 110.0 |
C3'—C4'—H4' | 108.2 | O151—C15'—C14' | 110.5 (3) |
O51—C5'—C4' | 107.6 (3) | O151—C15'—H15A | 109.6 |
O51—C5'—H5'1 | 110.2 | C14'—C15'—H15A | 109.6 |
C4'—C5'—H5'1 | 110.2 | O151—C15'—H15B | 109.6 |
O51—C5'—H5'2 | 110.2 | C14'—C15'—H15B | 109.6 |
C4'—C5'—H5'2 | 110.2 | H15A—C15'—H15B | 108.1 |
H5'1—C5'—H5'2 | 108.5 | C122—N121—C12 | 127.9 (4) |
C22—N21—C2 | 126.9 (3) | C122—N121—H121 | 120 (3) |
C22—N21—H21 | 121 (2) | C12—N121—H121 | 112 (3) |
C2—N21—H21 | 112 (2) | O122—C122—N121 | 121.9 (4) |
O22—C22—N21 | 123.7 (3) | O122—C122—C123 | 124.2 (4) |
O22—C22—C23 | 122.3 (4) | N121—C122—C123 | 113.9 (4) |
N21—C22—C23 | 114.0 (3) | C122—C123—H12A | 109.5 |
C22—C23—H23A | 109.5 | C122—C123—H12B | 109.5 |
C22—C23—H23B | 109.5 | H12A—C123—H12B | 109.5 |
H23A—C23—H23B | 109.5 | C122—C123—H12C | 109.5 |
C22—C23—H23C | 109.5 | H12A—C123—H12C | 109.5 |
H23A—C23—H23C | 109.5 | H12B—C123—H12C | 109.5 |
H23B—C23—H23C | 109.5 | O13—C130—O12 | 106.8 (3) |
O2—C30—O3 | 105.4 (3) | O13—C130—C131 | 113.2 (5) |
O2—C30—C31 | 110.0 (4) | O12—C130—C131 | 109.0 (4) |
O3—C30—C31 | 108.3 (4) | O13—C130—C132 | 106.4 (4) |
O2—C30—C32 | 107.9 (4) | O12—C130—C132 | 108.9 (4) |
O3—C30—C32 | 110.3 (4) | C131—C130—C132 | 112.2 (5) |
C31—C30—C32 | 114.6 (5) | C130—C131—H13A | 109.5 |
C30—C31—H31A | 109.5 | C130—C131—H13B | 109.5 |
C30—C31—H31B | 109.5 | H13A—C131—H13B | 109.5 |
H31A—C31—H31B | 109.5 | C130—C131—H13C | 109.5 |
C30—C31—H31C | 109.5 | H13A—C131—H13C | 109.5 |
H31A—C31—H31C | 109.5 | H13B—C131—H13C | 109.5 |
H31B—C31—H31C | 109.5 | C130—C132—H13D | 109.5 |
C30—C32—H32A | 109.5 | C130—C132—H13E | 109.5 |
C30—C32—H32B | 109.5 | H13D—C132—H13E | 109.5 |
H32A—C32—H32B | 109.5 | C130—C132—H13F | 109.5 |
C30—C32—H32C | 109.5 | H13D—C132—H13F | 109.5 |
H32A—C32—H32C | 109.5 | H13E—C132—H13F | 109.5 |
H32B—C32—H32C | 109.5 | C152—O151—C15' | 117.6 (4) |
C52—O51—C5' | 116.9 (3) | O152—C152—O151 | 122.2 (5) |
O52—C52—O51 | 122.1 (5) | O152—C152—C153 | 126.6 (6) |
O52—C52—C53 | 125.7 (5) | O151—C152—C153 | 111.1 (6) |
O51—C52—C53 | 112.2 (4) | C152—C153—H15C | 109.5 |
C52—C53—H53A | 109.5 | C152—C153—H15D | 109.5 |
C52—C53—H53B | 109.5 | H15C—C153—H15D | 109.5 |
H53A—C53—H53B | 109.5 | C152—C153—H15E | 109.5 |
C52—C53—H53C | 109.5 | H15C—C153—H15E | 109.5 |
H53A—C53—H53C | 109.5 | H15D—C153—H15E | 109.5 |
H53B—C53—H53C | 109.5 | H1WA—O1W—H1WB | 109.3 |
C12—N11—C16 | 125.4 (3) | H2WA—O2W—H2WB | 109.5 |
C6—N1—C2—N3 | −0.4 (5) | C16—N11—C12—N13 | −2.4 (5) |
C6—N1—C2—N21 | 179.7 (3) | C16—N11—C12—N121 | 177.5 (3) |
N1—C2—N3—C4 | 0.8 (4) | N11—C12—N13—C14 | 1.8 (5) |
N21—C2—N3—C4 | −179.2 (3) | N121—C12—N13—C14 | −178.1 (3) |
C2—N3—C4—N9 | 179.0 (3) | C12—N13—C14—N19 | 177.5 (3) |
C2—N3—C4—C5 | −0.9 (5) | C12—N13—C14—C15 | −0.7 (5) |
N3—C4—C5—N7 | −179.9 (3) | N13—C14—C15—N17 | 177.3 (3) |
N9—C4—C5—N7 | 0.2 (3) | N19—C14—C15—N17 | −1.2 (4) |
N3—C4—C5—C6 | 0.5 (5) | N13—C14—C15—C16 | 0.2 (5) |
N9—C4—C5—C6 | −179.5 (3) | N19—C14—C15—C16 | −178.3 (3) |
C2—N1—C6—O6 | −179.9 (3) | C12—N11—C16—O16 | −177.3 (3) |
C2—N1—C6—C5 | −0.1 (4) | C12—N11—C16—C15 | 1.5 (4) |
C4—C5—C6—O6 | 179.8 (3) | N17—C15—C16—O16 | 1.7 (6) |
N7—C5—C6—O6 | 0.2 (6) | C14—C15—C16—O16 | 178.1 (3) |
C4—C5—C6—N1 | 0.1 (4) | N17—C15—C16—N11 | −176.9 (3) |
N7—C5—C6—N1 | −179.5 (3) | C14—C15—C16—N11 | −0.5 (4) |
C4—C5—N7—C8 | −0.3 (4) | C14—C15—N17—C18 | 0.0 (4) |
C6—C5—N7—C8 | 179.3 (3) | C16—C15—N17—C18 | 176.7 (3) |
C5—N7—C8—N9 | 0.4 (4) | C15—N17—C18—N19 | 1.2 (4) |
N7—C8—N9—C4 | −0.3 (4) | N13—C14—N19—C18 | −176.8 (3) |
N7—C8—N9—C1' | −178.9 (3) | C15—C14—N19—C18 | 1.8 (3) |
N3—C4—N9—C8 | −179.9 (3) | N13—C14—N19—C11' | −7.1 (5) |
C5—C4—N9—C8 | 0.0 (3) | C15—C14—N19—C11' | 171.5 (3) |
N3—C4—N9—C1' | −1.3 (5) | N17—C18—N19—C14 | −2.0 (4) |
C5—C4—N9—C1' | 178.7 (3) | N17—C18—N19—C11' | −171.3 (3) |
C8—N9—C1'—O1 | 38.3 (5) | C14—N19—C11'—O11 | −178.9 (3) |
C4—N9—C1'—O1 | −140.0 (3) | C18—N19—C11'—O11 | −11.6 (4) |
C8—N9—C1'—C2' | −79.4 (4) | C14—N19—C11'—C12' | 61.3 (4) |
C4—N9—C1'—C2' | 102.3 (4) | C18—N19—C11'—C12' | −131.4 (3) |
O1—C1'—C2'—O2 | 92.1 (3) | O11—C11'—C12'—O12 | 114.1 (3) |
N9—C1'—C2'—O2 | −149.7 (3) | N19—C11'—C12'—O12 | −125.7 (3) |
O1—C1'—C2'—C3' | −15.9 (4) | O11—C11'—C12'—C13' | 0.8 (3) |
N9—C1'—C2'—C3' | 102.2 (3) | N19—C11'—C12'—C13' | 121.0 (3) |
O2—C2'—C3'—O3 | 29.8 (4) | N19—C11'—O11—C14' | −104.6 (3) |
C1'—C2'—C3'—O3 | 143.9 (3) | C12'—C11'—O11—C14' | 17.9 (4) |
O2—C2'—C3'—C4' | −88.5 (3) | C13'—C12'—O12—C130 | 10.4 (4) |
C1'—C2'—C3'—C4' | 25.6 (4) | C11'—C12'—O12—C130 | −101.5 (4) |
N9—C1'—O1—C4' | −122.1 (3) | C130—O13—C13'—C14' | 138.7 (4) |
C2'—C1'—O1—C4' | −1.1 (4) | C130—O13—C13'—C12' | 26.6 (5) |
C1'—C2'—O2—C30 | −146.2 (3) | O12—C12'—C13'—O13 | −22.4 (4) |
C3'—C2'—O2—C30 | −35.3 (4) | C11'—C12'—C13'—O13 | 96.8 (3) |
C4'—C3'—O3—C30 | 97.3 (4) | O12—C12'—C13'—C14' | −137.2 (3) |
C2'—C3'—O3—C30 | −13.9 (4) | C11'—C12'—C13'—C14' | −18.0 (4) |
C1'—O1—C4'—C5' | 144.7 (3) | C11'—O11—C14'—C13' | −29.4 (4) |
C1'—O1—C4'—C3' | 17.8 (4) | C11'—O11—C14'—C15' | 92.1 (4) |
O3—C3'—C4'—O1 | −139.0 (3) | O13—C13'—C14'—O11 | −81.7 (4) |
C2'—C3'—C4'—O1 | −26.4 (4) | C12'—C13'—C14'—O11 | 28.8 (4) |
O3—C3'—C4'—C5' | 99.4 (4) | O13—C13'—C14'—C15' | 160.1 (3) |
C2'—C3'—C4'—C5' | −147.9 (3) | C12'—C13'—C14'—C15' | −89.3 (4) |
O1—C4'—C5'—O51 | −69.8 (4) | O11—C14'—C15'—O151 | 168.8 (4) |
C3'—C4'—C5'—O51 | 50.2 (5) | C13'—C14'—C15'—O151 | −75.3 (4) |
N3—C2—N21—C22 | −179.0 (3) | N13—C12—N121—C122 | 175.0 (4) |
N1—C2—N21—C22 | 0.9 (5) | N11—C12—N121—C122 | −4.9 (5) |
C2—N21—C22—O22 | 3.1 (7) | C12—N121—C122—O122 | 0.1 (7) |
C2—N21—C22—C23 | −176.7 (4) | C12—N121—C122—C123 | −178.5 (4) |
C2'—O2—C30—O3 | 28.0 (4) | C13'—O13—C130—O12 | −21.0 (5) |
C2'—O2—C30—C31 | −88.6 (4) | C13'—O13—C130—C131 | 98.9 (5) |
C2'—O2—C30—C32 | 145.8 (4) | C13'—O13—C130—C132 | −137.3 (4) |
C3'—O3—C30—O2 | −7.7 (5) | C12'—O12—C130—O13 | 5.8 (5) |
C3'—O3—C30—C31 | 110.0 (4) | C12'—O12—C130—C131 | −116.9 (5) |
C3'—O3—C30—C32 | −123.8 (4) | C12'—O12—C130—C132 | 120.4 (4) |
C4'—C5'—O51—C52 | −170.8 (4) | C14'—C15'—O151—C152 | −105.0 (5) |
C5'—O51—C52—O52 | 0.0 (9) | C15'—O151—C152—O152 | 2.8 (9) |
C5'—O51—C52—C53 | −179.7 (5) | C15'—O151—C152—C153 | −174.4 (5) |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1···O22 | 0.77 (6) | 2.00 (6) | 2.649 (4) | 142 (5) |
N11—H11···O122 | 0.89 (5) | 2.01 (5) | 2.690 (5) | 133 (4) |
N21—H21···O1Wi | 0.89 (4) | 1.88 (4) | 2.757 (4) | 168 (4) |
N121—H121···O2Wii | 0.95 (5) | 1.98 (5) | 2.915 (5) | 169 (4) |
O2W—H2WA···N17 | 0.91 | 2.00 | 2.885 (4) | 162 |
O1W—H1WA···N7 | 0.87 | 1.91 | 2.775 (4) | 173 |
O2W—H2WB···O1Wiii | 0.87 | 2.15 | 3.011 (5) | 170 |
Symmetry codes: (i) x, y+1, z; (ii) x, y−1, z; (iii) x−1, y+1, z. |
Experimental details
Crystal data | |
Chemical formula | C17H21N5O7·H2O |
Mr | 425.40 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 293 |
a, b, c (Å) | 6.595 (1), 9.688 (1), 16.301 (1) |
α, β, γ (°) | 72.72 (1), 89.68 (1), 83.82 (1) |
V (Å3) | 988.34 (19) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 0.12 |
Crystal size (mm) | 0.50 × 0.23 × 0.16 |
Data collection | |
Diffractometer | Enraf–Nonius CAD-4 |
Absorption correction | – |
No. of measured, independent and observed [I > 2σ(I)] reflections | 6620, 5699, 4093 |
Rint | 0.017 |
(sin θ/λ)max (Å−1) | 0.711 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.050, 0.148, 1.03 |
No. of reflections | 5699 |
No. of parameters | 557 |
No. of restraints | 3 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.37, −0.24 |
Computer programs: CAD-4 EXPRESS (Enraf–Nonius, 1994), SET4 in CAD-4 EXPRESS, HELENA (Spek, 1996), SIR97 (Altomare et al., 1999), SHELXL97 (Sheldrick, 1997), PLATON (Spek, 2003) and Mercury (Macrae et al., 2006), SHELXL97.
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1···O22 | 0.77 (6) | 2.00 (6) | 2.649 (4) | 142 (5) |
N11—H11···O122 | 0.89 (5) | 2.01 (5) | 2.690 (5) | 133 (4) |
N21—H21···O1Wi | 0.89 (4) | 1.88 (4) | 2.757 (4) | 168 (4) |
N121—H121···O2Wii | 0.95 (5) | 1.98 (5) | 2.915 (5) | 169 (4) |
O2W—H2WA···N17 | 0.91 | 2.00 | 2.885 (4) | 161.9 |
O1W—H1WA···N7 | 0.87 | 1.91 | 2.775 (4) | 172.7 |
O2W—H2WB···O1Wiii | 0.87 | 2.15 | 3.011 (5) | 170.2 |
Symmetry codes: (i) x, y+1, z; (ii) x, y−1, z; (iii) x−1, y+1, z. |
Nucleosides and synthetically modified analogues participate in a variety of physiological processes (De Clercq & Field, 2006; Santaniello et al., 2005) and are known to self-associate via hydrogen bonding and base stacking (Shi et al., 2001). In particular, 2',3'-O-isopropylideneguanosine and derivatives are notable for their propensity to aggregate (Shi et al., 2003; Mande et al., 1988; Mande et al., 1989). However, the crystal structures of N2-acetylated guanosines have not been reported so far. In continuation of our research on the chemistry of nucleosides (Sá et al., 2002; Leitão et al., 2004), we recently developed a simple and inexpensive method for the synthesis of 2',3'-O-isopropylidene-2-N-5'-O-diacetylguanosine (I) in good yield and high purity (Sá & Meier, 2006). We now report the crystal structure of this compound.
The asymmetric unit consists of two independent molecules of (I) (Fig. 1) and two molecules of water. Distinct intermolecular interactions (Table 2) and different conformational parameters (Table 1) between the independent molecules of (I) lead the asymmetric unit to be greater than expected. A similar feature was also observed in the crystal structure of 2',3'-O-isopropylideneguanosine (II) reported by Mande et al. (1989).
Bond lengths and angles are within the expected ranges (Allen et al., 1987). Both molecules of (I) show R configuration for their chiral centers C1', C2', C3' and C4' in molecule A and C11', C12', C13' and C14' in molecule B. In molecule A the furanose ring adopts envelope conformation on C3' (pucker C3'-exo), where this atom is 0.421 (5) Å out of the least-squares plane defined by the remaining four atoms, with pseudorotation parameters P and τm of 20.6 (5)° and 27.6 (2)°. The dioxolane ring is twisted on O2—C2' bond and exhibits C30-exo–O2-endo type pucker with P = 112.7 (4)° and τm = 35.6 (2)°. Molecule B also shows the furanose ring as an envelope on C14' (pucker C14'-exo) with P = 233.3 (4)° and τm = 30.6 (2)°, where C14' is displaced of 0.431 (5) Å from the mean plane formed by the four other atoms. The dioxolane ring is twisted on C13'—O13 and exhibits C130-exo–O13-endo pucker type with pseudorotation parameters P = 355.8 (5)° and τm = 26.3 (2)°. In the N-acetylated groups, the conformation about the C4'—C5' bond is gauche–gauche with ΦOC = 50.2 (5)° and ΦOO = -69.7 (4)° for molecule A and about the C14'—C15' bond it is gauche-anti with ΦOC = -75.4 (4)° and ΦOO = 168.7 (3)° for molecule B. Similar conformations for these groups found in molecule A were reported for the crystal structure of compound (II) crystallized from Me2SO by Mande et al. (1988), but they are significantly different from those determined for (II) crystallized from water/acetone (Mande et al., 1989), where in both molecules the furanose rings are C1'-endo, the conformation around C4'—C5' bonds is anti–gauche and the dioxolane ring in molecule A (II) is C9-endo–O3'-exo.
The purine groups are essentially planar, but the deviation from planarity is slightly different in each independent molecule of (I). The r.m.s. deviations of 10 fitted atoms are 0.005 and 0.020 for molecules A and B, respectively. Despite the N—H···O intramolecular hydrogen bond (Table 2), the torsion angles N3—C2—N21—C22 of -179.0 (3)° and N13—C12—N121—C122 of 175.0 (3)° demonstrate that the terminal amide arms deviate distinctly from the correspondent purine mean plane, while the exocyclic O6 and O16 atoms are retained in their respective planes. The conformation of the nucleoside group is anti with torsion angles O1—C1'—N9—C4 of -140.1 (3)° [A] and O11—C11'—N19—C14 of -178.9 (3)° [B]. These values are significantly different from those found in compound (II), with torsion angles of -94.1° (Mande et al., 1988) and 74.1° and 77.5° (Mande et al., 1989).
The purine groups of molecules A and B are almost parallel, with a dihedral angles between their mean planes of 4.90 (2)°. The molecules are stacked in the [010] direction, with intercalated A and B molecules. In addition, a very interesting packing take place through intermolecular interactions (Fig. 2). The water molecule O1W links A molecules and the water molecule O2W links B molecules, forming an infinite chain, also along the crystallographic b axis. The O2W—H2WB···O1W hydrogen bond between water molecules connects the two chains, thus building a double-sheet polymeric structure.