research communications
H)-one: a molecular scaffold for potential tubulin polymerization inhibitors
of 6,7-dimethoxy-1-(4-nitrophenyl)quinolin-4(1aDepartment of Pharmaceutical Chemistry, University of Oslo, PO Box 1068 Blindern, N-0371 Oslo, Norway, and bDepartment of Chemistry, University of Oslo, PO Box 1033 Blindern, N-0315 Oslo, Norway
*Correspondence e-mail: c.h.gorbitz@kjemi.uio.no
The protein tubulin is central for maintaining normal cellular processes, and molecules interfering with the tubulin dynamics have potential in the treatment of cancerous diseases. The title compound, C17H14N2O5, was prepared as a lead compound in a project dedicated to the development of therapeutic agents binding to the colchicine binding site on tubulin, thereby interfering with the cell division in cancer cells. It holds many of the main structural characteristics for colchicine binding and has the potential for further modification and functionalization. In the title molecule, the benzene ring is inclined to the quinoline ring by 76.10 (8)°. In the crystal, molecules are linked by two pairs of C—H⋯O hydrogen bonds, forming tubular-like arrangements, propagating along the direction of the diagonals of the ab plane, and enclosing R22(26) and R22(16) ring motifs.
Keywords: crystal structure; cytotoxic agents; N-substituted quinolone; tubulin polymerization; hydrogen bonding.
CCDC reference: 1533984
1. Chemical context
Due to the elevated rate of cell division in cancer cells, agents targeting proteins central to the mitotic process are attractive for cancer treatment (Hanahan & Weinberg, 2011). The protein tubulin polymerizes during the mitotic phase into microtubules, and this process is vital for the correct cell division (Parker et al., 2014). Based on the structures of the natural products colchicine and comberastatin A-4, a great amount of research on the synthesis and biological evaluation has been carried out (Lu et al., 2012). All these analogs bind to the colchicine binding site, and the pharmacophore and binding site is well known (Nguyen et al., 2005).
Despite large research efforts, many colchicine-binding drug candidates suffer from resistance and toxicity problems (Lu et al., 2012). Therefore, further exploration and biological evaluation of possible structures is needed. From another medicinal chemistry project in our group, the title compound, (I), appeared as a side product in significant amounts. The structure was rationalized from NMR studies and confirmed by X-ray crystallography. Based on the literature and knowledge of the characteristics of molecules binding to the colchicine binding site on tubulin, it is reasonable that analogs of this structure might be potent cytotoxic agents. The reported structure can easily be further modified to improve binding affinities in correspondence with reported structure–activity studies (Lai et al., 2011; Wang et al., 2013; Patil et al., 2012). Herein, we present the synthesis and the of the title compound, 6,7-dimethoxy-1-(4-nitrophenyl)quinolin-4(1H)-one (I).
2. Database survey
The frequencies of molecules in the Cambridge Structural Database (CSD, version 5.37; Groom et al., 2016) incorporating various modifications of the quinolin-4(1H)-one fragment are shown in Fig. 1b. It can be seen that only one previous compound, 4-[6-methoxy-4-oxoquinolin-1(4H)-yl]benzonitrile (CSD refcode PEBDIL; Hirano et al., 2008) share with (I) the lack of substituents at C2 and C3 as well as having an aromatic N-substituent, while 1-ethyl-1,4-dihydro-6,7-methylenedioxy-4-oxo-3-quinolinecarboxylic acid (CSD refcode DAHWEO; Cygler & Huber, 1985) is alone in incorporating C2—H, C3—H, C6—O and C7—O bonds (Fig. 1a). Even though (I) is a rather simple covalent structure, it thus represents a rather unique combination of functionalities.
3. Structural commentary
The molecular structure of (I) is depicted in Fig. 2a, where the short, double-bond nature of the C2=C3 bond [1.342 (2) Å] is clearly visible. While the bicyclic ring systems of DAHWOE and PEBDIL (Fig. 1a) are perfectly coplanar with the C6 and C7 substituents as well as the C1′-atom attached to N1, this is not the case for (I); the nitrobenzene ring is inclined to the quinoline ring system by 76.10 (8)°, and the torsion angle defined by atom C9, the two ring centroids and atom C1′ is ca 167.7°; see Fig. 2a and 2b. The more extended search fragment in Fig. 1c found 157 such torsion angles in 62 CSD entries, and in only nine compounds does this torsion angle deviate by more than ca 13.3° from planarity.
4. Supramolecular features
The reason for the unusual molecular conformation of (I) can be seen in Fig. 2b and 2c, where close contacts to two neighbouring molecules are apparent; these force the methoxy group and the nitrophenyl group out of the quinolinone mean plane. In the crystal, molecules are linked by two pairs of C—H⋯O hydrogen bonds, forming tubular-like arrangements propagating along the direction of the diagonals of the ab plane, and enclosing R22(26) and R22(16) ring motifs (Table 1 and Fig. 3). Within the tubular-like arrangements, molecules are also linked by offset π–π interactions; the shortest interaction involves inversion-related pyridine rings with an inter-centroid distance Cg1⋯Cg1(−x + 1, −y + 2, −z + 1) = 3.659 (1) Å [Cg1 is the centroid of the N1/C2–C4/C4A/C8A ring; interplanar distance = 3.580 (1) Å, slippage = 0.754 Å]. The crystal density is comparatively high at 1.415 g cm−3, and no voids were calculated by Mercury (Macrae et al., 2008) using the default settings (probe radius 1.2 Å, grid spacing 0.7 Å).
5. Synthesis and crystallization
Cs2CO3 (0.212 g, 0.65 mmol) and 6,7-dimethoxyquinolin-4-ol (67 mg, 0.326 mmol) were weighed out in a round-bottom flask, to which was added 3 ml DMF and 1 ml MeCN. The mixture was then stirred for 15 min. 1-Fluoro-4-nitrobenzene (101 mg, 0.716 mmol) in 2 ml 1:1 DMF:MeCN was then added, and the reaction mixture was stirred for 20 h at 328 K. The crude product was washed with water (4 × 10 ml) and brine (10 ml), and then purified by [Hep:EtOAc (4:1) → Hep:EtOAc:MeOH (10:10:1)]. The title compound (I) was obtained as a yellow solid (40 mg, 38%). 1H NMR (CDCl3, 400 MHz): δ 8.48 (d, 2H, J = 8.8 Hz), 7.79 (s, 1H), 7.67 (d, 2H, J = 8.8 Hz), 7.48 (d, 1H, J = 7.8 Hz), 6.35 (d, 1H, J = 7.7 Hz), 6.32 (s, 1H), 3.98 (s, 3H), 3.72 (s, 3H). 13C NMR (CDCl3, 101 MHz): δ 176.98, 153.56, 147.96, 147.71, 146.91, 140.54, 136.08, 128.64, 125.92, 120.99, 110.68, 106.17, 98.10, 56.46, 56.21. HRMS (ESI+) m/z calculated for C17H15N2O5 [M+H]+: 327.0975, found 327.0976. Yellow crystals of compound (I) were grown from a heptane:EtOAc:MeOH (10:10:1) solution by slow evaporation of the solvent.
6. 1 Refinement
Crystal data, data collection and structure . The H atoms were included in calculated positions and treated as riding: C—H = 0.93–0.96 Å with Uiso(H) = 1.5Ueq(C-methyl) and 1.2Ueq(C) for other H atoms.
details are summarized in Table 2Supporting information
CCDC reference: 1533984
https://doi.org/10.1107/S2056989017002948/su5354sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S2056989017002948/su5354Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S2056989017002948/su5354Isup3.cml
Data collection: APEX3 (Bruker, 2016); cell
SAINT-Plus (Bruker, 2016); data reduction: SAINT-Plus (Bruker, 2016); program(s) used to solve structure: SHELXT2014 (Sheldrick, 2015a); program(s) used to refine structure: SHELXL2014 (Sheldrick, 2015b); molecular graphics: Mercury (Macrae et al., 2008); software used to prepare material for publication: SHELXL2014 (Sheldrick, 2015b).C17H14N2O5 | F(000) = 680 |
Mr = 326.30 | Dx = 1.415 Mg m−3 |
Monoclinic, P21/n | Mo Kα radiation, λ = 0.71073 Å |
a = 8.3736 (4) Å | Cell parameters from 8925 reflections |
b = 11.7694 (5) Å | θ = 2.6–26.4° |
c = 15.5623 (8) Å | µ = 0.11 mm−1 |
β = 93.251 (1)° | T = 295 K |
V = 1531.23 (13) Å3 | Flat lens, yellow |
Z = 4 | 0.66 × 0.27 × 0.08 mm |
Bruker D8 Venture diffractometer with a Photon 100 CMOS detector | 3142 independent reflections |
Radiation source: fine-focus sealed tube | 2298 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.032 |
Detector resolution: 8.3 pixels mm-1 | θmax = 26.4°, θmin = 2.2° |
Sets of exposures each taken over 0.5° ω rotation scans | h = −10→10 |
Absorption correction: multi-scan (SADABS; Bruker, 2016) | k = −14→14 |
Tmin = 0.930, Tmax = 1.000 | l = −19→19 |
20516 measured reflections |
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)] = 0.047 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.127 | H-atom parameters constrained |
S = 1.03 | w = 1/[σ2(Fo2) + (0.0557P)2 + 0.4805P] where P = (Fo2 + 2Fc2)/3 |
3142 reflections | (Δ/σ)max < 0.001 |
219 parameters | Δρmax = 0.20 e Å−3 |
0 restraints | Δρmin = −0.21 e Å−3 |
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes. |
x | y | z | Uiso*/Ueq | ||
O1 | 0.82921 (15) | 0.99910 (12) | 0.42505 (8) | 0.0623 (4) | |
O2 | 0.86545 (15) | 0.77881 (14) | 0.70970 (8) | 0.0684 (4) | |
O3 | 0.59678 (16) | 0.67943 (13) | 0.71853 (8) | 0.0679 (4) | |
N1 | 0.41894 (16) | 0.81504 (12) | 0.43553 (9) | 0.0477 (4) | |
C2 | 0.4438 (2) | 0.88507 (16) | 0.36804 (11) | 0.0528 (4) | |
H2 | 0.3660 | 0.8887 | 0.3230 | 0.063* | |
C3 | 0.5757 (2) | 0.94908 (16) | 0.36357 (12) | 0.0538 (5) | |
H3 | 0.5850 | 0.9969 | 0.3165 | 0.065* | |
C4 | 0.7020 (2) | 0.94582 (15) | 0.42906 (11) | 0.0466 (4) | |
C5 | 0.7864 (2) | 0.86419 (15) | 0.57179 (11) | 0.0461 (4) | |
H5 | 0.8813 | 0.9051 | 0.5704 | 0.055* | |
C6 | 0.7612 (2) | 0.79688 (16) | 0.64091 (11) | 0.0501 (4) | |
C7 | 0.6135 (2) | 0.73853 (16) | 0.64500 (11) | 0.0508 (4) | |
C8 | 0.5013 (2) | 0.74416 (16) | 0.57787 (11) | 0.0491 (4) | |
H8 | 0.4056 | 0.7045 | 0.5803 | 0.059* | |
C9 | 1.0221 (2) | 0.8218 (2) | 0.70451 (15) | 0.0789 (7) | |
H91 | 1.0657 | 0.7957 | 0.6523 | 0.118* | |
H92 | 1.0879 | 0.7955 | 0.7530 | 0.118* | |
H93 | 1.0191 | 0.9033 | 0.7047 | 0.118* | |
C10 | 0.4431 (3) | 0.6342 (2) | 0.73209 (14) | 0.0791 (7) | |
H101 | 0.3652 | 0.6941 | 0.7281 | 0.119* | |
H102 | 0.4437 | 0.6002 | 0.7882 | 0.119* | |
H103 | 0.4164 | 0.5777 | 0.6892 | 0.119* | |
C4A | 0.67157 (18) | 0.87302 (14) | 0.50243 (10) | 0.0422 (4) | |
C8A | 0.53089 (18) | 0.81007 (14) | 0.50514 (10) | 0.0430 (4) | |
O1' | −0.2498 (2) | 0.57251 (18) | 0.39917 (15) | 0.1105 (7) | |
O2' | −0.0978 (2) | 0.42948 (16) | 0.37958 (14) | 0.1038 (6) | |
N1' | −0.1179 (2) | 0.52979 (17) | 0.39326 (12) | 0.0718 (5) | |
C1' | 0.2824 (2) | 0.74056 (15) | 0.42899 (11) | 0.0460 (4) | |
C2' | 0.1327 (2) | 0.78390 (16) | 0.43907 (12) | 0.0547 (5) | |
H2' | 0.1198 | 0.8597 | 0.4540 | 0.066* | |
C3' | 0.0017 (2) | 0.71397 (17) | 0.42679 (13) | 0.0588 (5) | |
H3' | −0.1009 | 0.7421 | 0.4327 | 0.071* | |
C4' | 0.0242 (2) | 0.60273 (16) | 0.40578 (12) | 0.0532 (5) | |
C5' | 0.1729 (2) | 0.55765 (18) | 0.39643 (14) | 0.0663 (6) | |
H5' | 0.1852 | 0.4815 | 0.3823 | 0.080* | |
C6' | 0.3036 (2) | 0.62773 (17) | 0.40849 (14) | 0.0635 (5) | |
H6' | 0.4060 | 0.5992 | 0.4028 | 0.076* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0581 (8) | 0.0703 (9) | 0.0589 (8) | −0.0198 (7) | 0.0065 (6) | 0.0060 (7) |
O2 | 0.0502 (7) | 0.0978 (11) | 0.0556 (8) | −0.0166 (7) | −0.0109 (6) | 0.0185 (7) |
O3 | 0.0605 (8) | 0.0899 (10) | 0.0524 (8) | −0.0207 (7) | −0.0041 (6) | 0.0208 (7) |
N1 | 0.0440 (8) | 0.0555 (9) | 0.0431 (8) | −0.0060 (7) | −0.0013 (6) | −0.0012 (7) |
C2 | 0.0568 (10) | 0.0594 (11) | 0.0413 (10) | −0.0010 (9) | −0.0040 (8) | 0.0006 (9) |
C3 | 0.0608 (11) | 0.0567 (11) | 0.0439 (10) | −0.0062 (9) | 0.0039 (8) | 0.0050 (8) |
C4 | 0.0493 (10) | 0.0459 (9) | 0.0452 (10) | −0.0034 (8) | 0.0088 (7) | −0.0055 (8) |
C5 | 0.0388 (8) | 0.0533 (10) | 0.0463 (10) | −0.0070 (7) | 0.0041 (7) | −0.0036 (8) |
C6 | 0.0437 (9) | 0.0621 (11) | 0.0438 (10) | −0.0031 (8) | −0.0022 (7) | 0.0008 (8) |
C7 | 0.0498 (10) | 0.0593 (11) | 0.0433 (10) | −0.0067 (8) | 0.0043 (8) | 0.0055 (8) |
C8 | 0.0418 (9) | 0.0583 (10) | 0.0470 (10) | −0.0109 (8) | 0.0023 (7) | 0.0011 (8) |
C9 | 0.0613 (13) | 0.0953 (17) | 0.0772 (15) | −0.0268 (12) | −0.0206 (11) | 0.0183 (13) |
C10 | 0.0775 (14) | 0.1009 (18) | 0.0584 (13) | −0.0415 (13) | 0.0006 (10) | 0.0181 (12) |
C4A | 0.0407 (8) | 0.0448 (9) | 0.0414 (9) | −0.0013 (7) | 0.0061 (7) | −0.0053 (7) |
C8A | 0.0403 (9) | 0.0494 (10) | 0.0391 (9) | 0.0002 (7) | 0.0021 (7) | −0.0051 (7) |
O1' | 0.0539 (10) | 0.1104 (14) | 0.165 (2) | −0.0167 (10) | −0.0103 (10) | −0.0218 (13) |
O2' | 0.0966 (13) | 0.0717 (12) | 0.1419 (18) | −0.0284 (10) | −0.0051 (11) | −0.0223 (11) |
N1' | 0.0650 (12) | 0.0740 (13) | 0.0750 (12) | −0.0178 (10) | −0.0073 (9) | −0.0091 (10) |
C1' | 0.0446 (9) | 0.0528 (10) | 0.0402 (9) | −0.0043 (8) | −0.0018 (7) | −0.0047 (8) |
C2' | 0.0497 (10) | 0.0523 (10) | 0.0616 (12) | 0.0017 (8) | −0.0004 (8) | −0.0110 (9) |
C3' | 0.0430 (10) | 0.0652 (12) | 0.0681 (13) | 0.0017 (9) | 0.0013 (9) | −0.0098 (10) |
C4' | 0.0504 (10) | 0.0596 (11) | 0.0489 (10) | −0.0094 (9) | −0.0037 (8) | −0.0077 (9) |
C5' | 0.0638 (12) | 0.0512 (11) | 0.0842 (15) | −0.0031 (10) | 0.0050 (10) | −0.0163 (10) |
C6' | 0.0481 (10) | 0.0614 (12) | 0.0813 (14) | 0.0039 (9) | 0.0061 (9) | −0.0145 (11) |
O1—C4 | 1.241 (2) | C9—H91 | 0.9600 |
O2—C6 | 1.359 (2) | C9—H92 | 0.9600 |
O2—C9 | 1.412 (2) | C9—H93 | 0.9600 |
O3—C7 | 1.353 (2) | C10—H101 | 0.9600 |
O3—C10 | 1.419 (2) | C10—H102 | 0.9600 |
N1—C2 | 1.360 (2) | C10—H103 | 0.9600 |
N1—C8A | 1.393 (2) | C4A—C8A | 1.394 (2) |
N1—C1' | 1.440 (2) | O1'—N1' | 1.222 (2) |
C2—C3 | 1.342 (2) | O2'—N1' | 1.213 (2) |
C2—H2 | 0.9300 | N1'—C4' | 1.471 (2) |
C3—C4 | 1.427 (3) | C1'—C2' | 1.370 (2) |
C3—H3 | 0.9300 | C1'—C6' | 1.380 (3) |
C4—C4A | 1.461 (2) | C2'—C3' | 1.376 (3) |
C5—C6 | 1.362 (2) | C2'—H2' | 0.9300 |
C5—C4A | 1.408 (2) | C3'—C4' | 1.365 (3) |
C5—H5 | 0.9300 | C3'—H3' | 0.9300 |
C6—C7 | 1.419 (2) | C4'—C5' | 1.369 (3) |
C7—C8 | 1.366 (2) | C5'—C6' | 1.375 (3) |
C8—C8A | 1.406 (2) | C5'—H5' | 0.9300 |
C8—H8 | 0.9300 | C6'—H6' | 0.9300 |
C6—O2—C9 | 117.12 (15) | O3—C10—H102 | 109.5 |
C7—O3—C10 | 117.17 (15) | H101—C10—H102 | 109.5 |
C2—N1—C8A | 120.01 (14) | O3—C10—H103 | 109.5 |
C2—N1—C1' | 118.03 (14) | H101—C10—H103 | 109.5 |
C8A—N1—C1' | 121.74 (14) | H102—C10—H103 | 109.5 |
C3—C2—N1 | 122.86 (16) | C8A—C4A—C5 | 118.63 (15) |
C3—C2—H2 | 118.6 | C8A—C4A—C4 | 121.33 (15) |
N1—C2—H2 | 118.6 | C5—C4A—C4 | 120.03 (15) |
C2—C3—C4 | 121.77 (17) | N1—C8A—C4A | 119.12 (15) |
C2—C3—H3 | 119.1 | N1—C8A—C8 | 120.52 (15) |
C4—C3—H3 | 119.1 | C4A—C8A—C8 | 120.35 (15) |
O1—C4—C3 | 123.65 (16) | O2'—N1'—O1' | 123.3 (2) |
O1—C4—C4A | 121.58 (16) | O2'—N1'—C4' | 118.15 (19) |
C3—C4—C4A | 114.77 (15) | O1'—N1'—C4' | 118.53 (19) |
C6—C5—C4A | 121.24 (15) | C2'—C1'—C6' | 121.02 (17) |
C6—C5—H5 | 119.4 | C2'—C1'—N1 | 119.55 (16) |
C4A—C5—H5 | 119.4 | C6'—C1'—N1 | 119.35 (16) |
O2—C6—C5 | 126.29 (16) | C1'—C2'—C3' | 119.25 (17) |
O2—C6—C7 | 114.29 (15) | C1'—C2'—H2' | 120.4 |
C5—C6—C7 | 119.43 (16) | C3'—C2'—H2' | 120.4 |
O3—C7—C8 | 124.88 (16) | C4'—C3'—C2' | 119.14 (17) |
O3—C7—C6 | 114.76 (15) | C4'—C3'—H3' | 120.4 |
C8—C7—C6 | 120.36 (16) | C2'—C3'—H3' | 120.4 |
C7—C8—C8A | 119.83 (16) | C3'—C4'—C5' | 122.41 (17) |
C7—C8—H8 | 120.1 | C3'—C4'—N1' | 118.02 (17) |
C8A—C8—H8 | 120.1 | C5'—C4'—N1' | 119.57 (18) |
O2—C9—H91 | 109.5 | C4'—C5'—C6' | 118.35 (18) |
O2—C9—H92 | 109.5 | C4'—C5'—H5' | 120.8 |
H91—C9—H92 | 109.5 | C6'—C5'—H5' | 120.8 |
O2—C9—H93 | 109.5 | C5'—C6'—C1' | 119.82 (18) |
H91—C9—H93 | 109.5 | C5'—C6'—H6' | 120.1 |
H92—C9—H93 | 109.5 | C1'—C6'—H6' | 120.1 |
O3—C10—H101 | 109.5 | ||
C8A—N1—C2—C3 | 1.9 (3) | C1'—N1—C8A—C8 | −9.9 (2) |
C1'—N1—C2—C3 | −172.90 (17) | C5—C4A—C8A—N1 | −177.76 (15) |
N1—C2—C3—C4 | 1.6 (3) | C4—C4A—C8A—N1 | 1.4 (2) |
C2—C3—C4—O1 | 176.06 (18) | C5—C4A—C8A—C8 | 3.4 (2) |
C2—C3—C4—C4A | −3.3 (3) | C4—C4A—C8A—C8 | −177.44 (15) |
C9—O2—C6—C5 | −8.6 (3) | C7—C8—C8A—N1 | 178.84 (16) |
C9—O2—C6—C7 | 171.73 (18) | C7—C8—C8A—C4A | −2.3 (3) |
C4A—C5—C6—O2 | 177.51 (17) | C2—N1—C1'—C2' | −75.8 (2) |
C4A—C5—C6—C7 | −2.9 (3) | C8A—N1—C1'—C2' | 109.47 (19) |
C10—O3—C7—C8 | −9.8 (3) | C2—N1—C1'—C6' | 101.0 (2) |
C10—O3—C7—C6 | 170.42 (18) | C8A—N1—C1'—C6' | −73.7 (2) |
O2—C6—C7—O3 | 3.4 (2) | C6'—C1'—C2'—C3' | −1.3 (3) |
C5—C6—C7—O3 | −176.25 (17) | N1—C1'—C2'—C3' | 175.48 (17) |
O2—C6—C7—C8 | −176.36 (18) | C1'—C2'—C3'—C4' | 0.7 (3) |
C5—C6—C7—C8 | 4.0 (3) | C2'—C3'—C4'—C5' | 0.1 (3) |
O3—C7—C8—C8A | 178.89 (17) | C2'—C3'—C4'—N1' | 179.83 (18) |
C6—C7—C8—C8A | −1.4 (3) | O2'—N1'—C4'—C3' | −175.7 (2) |
C6—C5—C4A—C8A | −0.8 (2) | O1'—N1'—C4'—C3' | 2.5 (3) |
C6—C5—C4A—C4 | −179.93 (16) | O2'—N1'—C4'—C5' | 4.1 (3) |
O1—C4—C4A—C8A | −177.59 (16) | O1'—N1'—C4'—C5' | −177.7 (2) |
C3—C4—C4A—C8A | 1.8 (2) | C3'—C4'—C5'—C6' | −0.2 (3) |
O1—C4—C4A—C5 | 1.6 (2) | N1'—C4'—C5'—C6' | 179.99 (19) |
C3—C4—C4A—C5 | −179.05 (16) | C4'—C5'—C6'—C1' | −0.4 (3) |
C2—N1—C8A—C4A | −3.3 (2) | C2'—C1'—C6'—C5' | 1.1 (3) |
C1'—N1—C8A—C4A | 171.27 (15) | N1—C1'—C6'—C5' | −175.66 (18) |
C2—N1—C8A—C8 | 175.52 (16) |
D—H···A | D—H | H···A | D···A | D—H···A |
C2′—H2′···O1i | 0.93 | 2.53 | 3.320 (2) | 143 |
C10—H103···O1′ii | 0.96 | 2.60 | 3.512 (3) | 160 |
Symmetry codes: (i) −x+1, −y+2, −z+1; (ii) −x, −y+1, −z+1. |
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