organic compounds
3-Hydroxy-2-[(2E)-1-(2-hydroxy-6-oxocyclohex-1-en-1-yl)-3-(2-methoxyphenyl)prop-2-en-1-yl]cyclohex-2-en-1-one
aAdvanced Analysis Center, Korea Institute of Science & Technology, Hwarangro, 14-gil, Seongbuk-gu, Seoul, 136-791, South Korea, and bCenter for Neuro-Medicine, Korea Institute of Science & Technology, Hwarangro 14-gil, Seongbuk-gu, Seoul, 136-791, South Korea
*Correspondence e-mail: j9601@kist.re.kr
In the title compound, C22H24O5, each of the cyclohexenone rings adopts a half-chair conformation. The hydroxy and carbonyl O atoms face each other and are orientated to allow for the formation of the two intramolecular O—H⋯O hydrogen bonds which are typical of xanthene derivatives. In the crystal, weak intermolecular C—H⋯O hydrogen bonds link molecules into layers parallel to the ab plane.
Related literature
For the biological activity of xanthenes and their derivatives, see: Jonathan et al. (1988); Delfourne et al. (2000); Koeller et al. (2003); For related xanthene structures, see: Bolte et al. (2001); Palakshi Reddy et al. (2010).
Experimental
Crystal data
|
Refinement
|
Data collection: RAPID-AUTO (Rigaku, 2006); cell RAPID-AUTO; data reduction: RAPID-AUTO; program(s) used to solve structure: IL MILIONE (Burla et al., 2007); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: CrystalStructure (Rigaku, 2010); software used to prepare material for publication: CrystalStructure.
Supporting information
https://doi.org/10.1107/S1600536811038207/cv5143sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536811038207/cv5143Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S1600536811038207/cv5143Isup3.cml
To solution of 1,3-cyclohexanedione (4.68 mmol), 2-methoxycinnamaldehyde (1.87 mmol) and 4Å MS was added catalytic amounts of L-proline (0.47 mmol) in under nitrogen atmosphere. After stirring for 5 h, the anhydrous ethyl acetate (0.5 ml) was added to a reaction mixture and the solution was stirred for 2 days. The reaction mixture was filtered through pad of celite to remove MS and concentrated. The residue oil was purified by flash
to afford product which was recrystallized from ethanol to give crystals suitable for X-ray analysis.Atoms H8 and H9 were located on a difference map and isotropically refined. All the rest H atoms were positioned geometrically and refined using a riding model with C—H = 0.93–0.98 Å and Uiso(H) = 1.2 or 1.5 Ueq(C). Rotating group model was applied for the methyl groups.
Xanthenes constitute an important class of organic compounds that have attracted strong interest due to their useful biological and pharmacological properties, such as antibacterial, antiviral and antiinflammatory activities (Jonathan et al., 1988). They also constitute a structural unit of a series of natural products (Delfourne et al., 2000). Also they are being developed to act as new clinical agents in cancer therapy (Koeller et al., 2003). Herewith we present the
of the title compound (I) (Fig. 1), which is a Xanthene derivative.The molecular structure of xanthenedione features two cyclohexene rings, each has a half-chair conformation and lie above the respective least-squares plane through the remaining five carbon atoms (Palakshi Reddy et al., 2010). Bolte and colleagues determined the crystal structures of bis-dimedone derivatives which showed nearly the same packing pattern irrespective of the different substituent in the para position of the aromatic ring (Bolte et al., 2001). Two cyclohexenone rings in (I) display
and atoms C14 and C19 are directed towards the aromatic ring. The hydroxy and carbonyl O atoms face each other and are orientated to allow for the formation of two intramolecular O—H···O hydrogen bonds (Table 1) typical for Xanthene derivative.In the
weak intermolecular C—H···O hydrogen bonds (Table 1) links the molecules into layers parallel to ab plane.For the biological activity of xanthenes and their derivatives, see: Jonathan et al. (1988); Delfourne et al. (2000); Koeller et al. (2003); For related xanthene structures, see: Bolte et al. (2001); Palakshi Reddy et al. (2010).
Data collection: RAPID-AUTO (Rigaku, 2006); cell
RAPID-AUTO (Rigaku, 2006); data reduction: RAPID-AUTO (Rigaku, 2006); program(s) used to solve structure: IL MILIONE (Burla et al., 2007); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: CrystalStructure (Rigaku, 2010); software used to prepare material for publication: CrystalStructure (Rigaku, 2010).Fig. 1. The molecular structure of (I) showing the atomic numbering and 50% probability displacement ellipsoids. |
C22H24O5 | F(000) = 784.00 |
Mr = 368.43 | Dx = 1.293 Mg m−3 |
Monoclinic, P21/n | Mo Kα radiation, λ = 0.71075 Å |
Hall symbol: -P 2yn | Cell parameters from 11442 reflections |
a = 10.7988 (8) Å | θ = 3.2–27.4° |
b = 12.0509 (8) Å | µ = 0.09 mm−1 |
c = 15.0238 (10) Å | T = 297 K |
β = 104.536 (2)° | Chunk, colourless |
V = 1892.5 (3) Å3 | 0.40 × 0.20 × 0.20 mm |
Z = 4 |
Rigaku R-AXIS RAPID diffractometer | 2465 reflections with F2 > 2.0σ(F2) |
Detector resolution: 10.000 pixels mm-1 | Rint = 0.033 |
ω scans | θmax = 27.5° |
Absorption correction: multi-scan (ABSCOR; Rigaku, 1995) | h = −14→13 |
Tmin = 0.715, Tmax = 0.982 | k = −15→13 |
18125 measured reflections | l = −19→19 |
4304 independent reflections |
Refinement on F2 | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.038 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.119 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.05 | w = 1/[σ2(Fo2) + (0.0612P)2 + 0.0196P] where P = (Fo2 + 2Fc2)/3 |
4304 reflections | (Δ/σ)max < 0.001 |
255 parameters | Δρmax = 0.18 e Å−3 |
0 restraints | Δρmin = −0.20 e Å−3 |
Primary atom site location: structure-invariant direct methods |
C22H24O5 | V = 1892.5 (3) Å3 |
Mr = 368.43 | Z = 4 |
Monoclinic, P21/n | Mo Kα radiation |
a = 10.7988 (8) Å | µ = 0.09 mm−1 |
b = 12.0509 (8) Å | T = 297 K |
c = 15.0238 (10) Å | 0.40 × 0.20 × 0.20 mm |
β = 104.536 (2)° |
Rigaku R-AXIS RAPID diffractometer | 4304 independent reflections |
Absorption correction: multi-scan (ABSCOR; Rigaku, 1995) | 2465 reflections with F2 > 2.0σ(F2) |
Tmin = 0.715, Tmax = 0.982 | Rint = 0.033 |
18125 measured reflections |
R[F2 > 2σ(F2)] = 0.038 | 0 restraints |
wR(F2) = 0.119 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.05 | Δρmax = 0.18 e Å−3 |
4304 reflections | Δρmin = −0.20 e Å−3 |
255 parameters |
Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes. |
Refinement. Refinement was performed using all reflections. The weighted R-factor (wR) and goodness of fit (S) are based on F2. R-factor (gt) are based on F. The threshold expression of F2 > 2.0 σ(F2) is used only for calculating R-factor (gt). |
x | y | z | Uiso*/Ueq | ||
O1 | 0.09043 (11) | 0.05978 (9) | −0.07867 (8) | 0.0658 (4) | |
O2 | 0.28313 (11) | 0.19541 (10) | 0.23571 (8) | 0.0645 (4) | |
O3 | 0.41828 (12) | 0.47367 (10) | 0.06364 (9) | 0.0663 (4) | |
O4 | 0.51114 (12) | 0.11253 (10) | 0.29205 (9) | 0.0724 (4) | |
O5 | 0.65368 (11) | 0.41783 (9) | 0.15245 (8) | 0.0632 (4) | |
C1 | −0.02975 (16) | 0.04933 (18) | −0.14336 (13) | 0.0742 (6) | |
C2 | 0.15960 (14) | −0.03397 (12) | −0.04910 (10) | 0.0488 (4) | |
C3 | 0.11998 (17) | −0.13977 (14) | −0.07901 (12) | 0.0626 (5) | |
C4 | 0.19488 (18) | −0.23024 (14) | −0.04442 (14) | 0.0678 (5) | |
C5 | 0.30822 (16) | −0.21703 (13) | 0.02058 (13) | 0.0625 (5) | |
C6 | 0.34792 (15) | −0.11098 (12) | 0.05032 (11) | 0.0520 (4) | |
C7 | 0.27626 (13) | −0.01761 (12) | 0.01666 (10) | 0.0434 (4) | |
C8 | 0.31364 (14) | 0.09541 (12) | 0.05010 (10) | 0.0446 (4) | |
C9 | 0.42886 (14) | 0.12987 (12) | 0.09303 (10) | 0.0459 (4) | |
C10 | 0.46403 (12) | 0.24820 (11) | 0.12552 (10) | 0.0416 (4) | |
C11 | 0.58135 (13) | 0.25288 (11) | 0.20732 (10) | 0.0429 (4) | |
C12 | 0.59878 (15) | 0.18020 (13) | 0.28119 (11) | 0.0517 (4) | |
C13 | 0.72021 (16) | 0.17659 (15) | 0.35550 (12) | 0.0646 (5) | |
C14 | 0.83130 (17) | 0.22703 (16) | 0.32580 (14) | 0.0732 (6) | |
C15 | 0.79534 (15) | 0.34015 (16) | 0.28366 (13) | 0.0653 (5) | |
C16 | 0.67165 (14) | 0.33779 (13) | 0.21009 (11) | 0.0497 (4) | |
C17 | 0.26577 (14) | 0.28332 (13) | 0.18620 (11) | 0.0492 (4) | |
C18 | 0.14924 (15) | 0.35094 (15) | 0.18728 (12) | 0.0622 (5) | |
C19 | 0.10349 (16) | 0.41715 (15) | 0.10015 (13) | 0.0679 (6) | |
C20 | 0.21250 (16) | 0.48847 (15) | 0.08684 (13) | 0.0664 (5) | |
C21 | 0.33291 (15) | 0.42426 (12) | 0.09539 (11) | 0.0492 (4) | |
C22 | 0.35061 (13) | 0.31784 (11) | 0.13452 (10) | 0.0417 (4) | |
H1A | −0.0834 | −0.0000 | −0.1195 | 0.0890* | |
H1B | −0.0175 | 0.0201 | −0.1999 | 0.0890* | |
H1C | −0.0698 | 0.1209 | −0.1544 | 0.0890* | |
H3 | 0.0427 | −0.1499 | −0.1225 | 0.0751* | |
H3A | 0.4882 | 0.4448 | 0.0851 | 0.0795* | |
H4 | 0.1682 | −0.3010 | −0.0655 | 0.0813* | |
H4A | 0.4409 | 0.1351 | 0.2632 | 0.0868* | |
H5 | 0.3578 | −0.2783 | 0.0444 | 0.0750* | |
H6 | 0.4251 | −0.1021 | 0.0942 | 0.0624* | |
H8 | 0.2464 (14) | 0.1475 (12) | 0.0421 (10) | 0.043 (4)* | |
H9 | 0.4989 (16) | 0.0791 (13) | 0.1032 (11) | 0.057 (5)* | |
H10 | 0.4924 | 0.2827 | 0.0750 | 0.0499* | |
H13A | 0.7402 | 0.1001 | 0.3735 | 0.0776* | |
H13B | 0.7081 | 0.2163 | 0.4088 | 0.0776* | |
H14A | 0.8555 | 0.1789 | 0.2812 | 0.0878* | |
H14B | 0.9042 | 0.2339 | 0.3785 | 0.0878* | |
H15A | 0.7873 | 0.3917 | 0.3315 | 0.0783* | |
H15B | 0.8631 | 0.3668 | 0.2573 | 0.0783* | |
H18A | 0.1692 | 0.4011 | 0.2394 | 0.0747* | |
H18B | 0.0813 | 0.3019 | 0.1947 | 0.0747* | |
H19A | 0.0318 | 0.4636 | 0.1044 | 0.0815* | |
H19B | 0.0753 | 0.3675 | 0.0482 | 0.0815* | |
H20A | 0.1881 | 0.5225 | 0.0265 | 0.0797* | |
H20B | 0.2280 | 0.5474 | 0.1322 | 0.0797* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0519 (7) | 0.0618 (7) | 0.0705 (8) | −0.0035 (6) | −0.0095 (6) | 0.0080 (6) |
O2 | 0.0689 (8) | 0.0638 (8) | 0.0656 (8) | −0.0072 (6) | 0.0257 (6) | 0.0071 (6) |
O3 | 0.0630 (8) | 0.0536 (7) | 0.0817 (9) | 0.0034 (6) | 0.0172 (7) | 0.0186 (6) |
O4 | 0.0691 (8) | 0.0665 (8) | 0.0769 (9) | −0.0077 (7) | 0.0098 (7) | 0.0239 (7) |
O5 | 0.0572 (7) | 0.0508 (7) | 0.0782 (8) | −0.0137 (5) | 0.0107 (6) | 0.0069 (6) |
C1 | 0.0495 (10) | 0.0975 (15) | 0.0642 (11) | −0.0084 (10) | −0.0070 (9) | 0.0180 (10) |
C2 | 0.0461 (9) | 0.0512 (9) | 0.0466 (9) | −0.0057 (7) | 0.0067 (7) | 0.0001 (7) |
C3 | 0.0601 (10) | 0.0625 (11) | 0.0596 (10) | −0.0195 (9) | 0.0046 (8) | −0.0101 (9) |
C4 | 0.0716 (12) | 0.0504 (10) | 0.0816 (13) | −0.0154 (9) | 0.0199 (10) | −0.0154 (9) |
C5 | 0.0592 (11) | 0.0444 (9) | 0.0842 (13) | −0.0005 (8) | 0.0184 (10) | −0.0037 (9) |
C6 | 0.0430 (9) | 0.0493 (9) | 0.0618 (10) | −0.0009 (7) | 0.0095 (8) | −0.0019 (8) |
C7 | 0.0418 (8) | 0.0425 (8) | 0.0454 (8) | −0.0040 (6) | 0.0096 (7) | −0.0015 (7) |
C8 | 0.0433 (8) | 0.0420 (8) | 0.0456 (8) | 0.0013 (7) | 0.0058 (7) | −0.0019 (7) |
C9 | 0.0421 (8) | 0.0419 (8) | 0.0511 (9) | −0.0004 (7) | 0.0073 (7) | −0.0022 (7) |
C10 | 0.0390 (8) | 0.0400 (7) | 0.0442 (8) | −0.0033 (6) | 0.0076 (7) | −0.0007 (7) |
C11 | 0.0386 (8) | 0.0391 (7) | 0.0492 (8) | −0.0009 (6) | 0.0077 (7) | −0.0026 (7) |
C12 | 0.0526 (9) | 0.0446 (8) | 0.0553 (9) | 0.0035 (7) | 0.0084 (8) | 0.0009 (7) |
C13 | 0.0668 (12) | 0.0593 (10) | 0.0562 (10) | 0.0119 (9) | −0.0062 (9) | 0.0020 (9) |
C14 | 0.0473 (10) | 0.0858 (13) | 0.0741 (12) | 0.0122 (9) | −0.0079 (9) | −0.0055 (11) |
C15 | 0.0421 (9) | 0.0754 (11) | 0.0720 (11) | −0.0108 (8) | 0.0026 (8) | −0.0105 (10) |
C16 | 0.0414 (8) | 0.0488 (8) | 0.0568 (9) | −0.0024 (7) | 0.0086 (7) | −0.0072 (8) |
C17 | 0.0448 (9) | 0.0504 (9) | 0.0507 (9) | −0.0078 (7) | 0.0086 (7) | −0.0110 (8) |
C18 | 0.0466 (9) | 0.0694 (11) | 0.0731 (12) | −0.0054 (8) | 0.0193 (8) | −0.0233 (10) |
C19 | 0.0439 (9) | 0.0700 (11) | 0.0824 (13) | 0.0101 (8) | 0.0016 (9) | −0.0209 (10) |
C20 | 0.0605 (11) | 0.0552 (10) | 0.0769 (12) | 0.0145 (8) | 0.0047 (9) | −0.0055 (9) |
C21 | 0.0475 (9) | 0.0467 (8) | 0.0486 (9) | −0.0012 (7) | 0.0031 (7) | −0.0041 (7) |
C22 | 0.0377 (8) | 0.0413 (8) | 0.0427 (8) | −0.0030 (6) | 0.0034 (6) | −0.0046 (7) |
O1—C1 | 1.4183 (19) | C20—C21 | 1.491 (3) |
O1—C2 | 1.3657 (18) | C21—C22 | 1.404 (2) |
O2—C17 | 1.281 (2) | O3—H3A | 0.820 |
O3—C21 | 1.286 (3) | O4—H4A | 0.820 |
O4—C12 | 1.290 (3) | C1—H1A | 0.960 |
O5—C16 | 1.278 (2) | C1—H1B | 0.960 |
C2—C3 | 1.383 (3) | C1—H1C | 0.960 |
C2—C7 | 1.4061 (19) | C3—H3 | 0.930 |
C3—C4 | 1.379 (3) | C4—H4 | 0.930 |
C4—C5 | 1.370 (3) | C5—H5 | 0.930 |
C5—C6 | 1.386 (3) | C6—H6 | 0.930 |
C6—C7 | 1.387 (2) | C8—H8 | 0.944 (15) |
C7—C8 | 1.473 (2) | C9—H9 | 0.954 (17) |
C8—C9 | 1.317 (2) | C10—H10 | 0.980 |
C9—C10 | 1.524 (2) | C13—H13A | 0.970 |
C10—C11 | 1.5287 (18) | C13—H13B | 0.970 |
C10—C22 | 1.519 (2) | C14—H14A | 0.970 |
C11—C12 | 1.389 (3) | C14—H14B | 0.970 |
C11—C16 | 1.407 (2) | C15—H15A | 0.970 |
C12—C13 | 1.494 (2) | C15—H15B | 0.970 |
C13—C14 | 1.509 (3) | C18—H18A | 0.970 |
C14—C15 | 1.512 (3) | C18—H18B | 0.970 |
C15—C16 | 1.505 (2) | C19—H19A | 0.970 |
C17—C18 | 1.503 (3) | C19—H19B | 0.970 |
C17—C22 | 1.404 (3) | C20—H20A | 0.970 |
C18—C19 | 1.507 (3) | C20—H20B | 0.970 |
C19—C20 | 1.511 (3) | ||
O1···C8 | 2.7196 (17) | C8···H13Bi | 3.1204 |
O2···O4 | 2.5943 (17) | C8···H15Ai | 3.2285 |
O2···C8 | 3.130 (2) | C9···H6iv | 3.5698 |
O2···C9 | 3.064 (3) | C9···H14Bi | 3.5664 |
O2···C10 | 2.930 (2) | C10···H5iv | 3.5801 |
O2···C11 | 3.424 (2) | C11···H1Bviii | 3.3634 |
O2···C12 | 3.309 (2) | C11···H1Cviii | 3.3161 |
O2···C21 | 3.593 (2) | C12···H1Cviii | 3.2985 |
O3···O5 | 2.6443 (16) | C13···H8viii | 3.470 (15) |
O3···C10 | 2.8741 (18) | C13···H20Aviii | 3.5946 |
O3···C11 | 3.5961 (18) | C14···H5v | 3.4339 |
O3···C16 | 3.4622 (19) | C14···H6v | 3.3192 |
O3···C17 | 3.590 (3) | C15···H4iv | 3.4312 |
O4···C9 | 2.905 (2) | C15···H6v | 3.1913 |
O4···C10 | 2.924 (2) | C16···H1Bviii | 3.2120 |
O4···C17 | 3.4162 (19) | C16···H4iv | 3.1300 |
O4···C22 | 3.5593 (18) | C17···H1Bviii | 3.4654 |
O5···C10 | 2.8497 (18) | C17···H1Cviii | 2.8440 |
O5···C12 | 3.587 (2) | C18···H1Cviii | 3.3703 |
O5···C21 | 3.354 (2) | C18···H3vi | 3.1780 |
O5···C22 | 3.4341 (19) | C18···H4vi | 3.5086 |
C1···C3 | 2.821 (3) | C18···H15Bxii | 3.5102 |
C2···C5 | 2.774 (3) | C19···H4vi | 3.1730 |
C3···C6 | 2.748 (3) | C19···H4Aix | 3.4414 |
C4···C7 | 2.788 (3) | C19···H19Axiii | 3.3752 |
C6···C9 | 3.053 (2) | C19···H20Axiii | 3.3249 |
C8···C17 | 3.179 (3) | C20···H4x | 3.3690 |
C8···C22 | 2.949 (2) | C20···H4Aix | 3.5808 |
C9···C12 | 3.020 (2) | C20···H5x | 3.3566 |
C9···C17 | 3.117 (3) | C20···H13Ai | 3.4621 |
C11···C14 | 2.853 (2) | C20···H19Axiii | 3.4272 |
C11···C17 | 3.362 (2) | C21···H1Bviii | 3.1656 |
C11···C21 | 3.468 (2) | C21···H13Ai | 3.2451 |
C12···C15 | 2.861 (3) | C21···H13Bi | 3.2631 |
C12···C22 | 3.439 (2) | C22···H1Bviii | 3.2018 |
C13···C16 | 2.872 (3) | C22···H1Cviii | 3.1582 |
C16···C22 | 3.375 (2) | C22···H13Bi | 3.3789 |
C17···C20 | 2.871 (3) | H1A···O1vi | 3.0828 |
C18···C21 | 2.828 (3) | H1A···O2vi | 3.3695 |
C19···C22 | 2.851 (3) | H1A···C2vi | 2.8827 |
O1···C15i | 3.595 (3) | H1A···C3vi | 3.5331 |
O3···O3ii | 2.978 (2) | H1A···C6vi | 3.5387 |
O3···O5ii | 3.4039 (18) | H1A···C7vi | 2.8961 |
O4···C19iii | 3.272 (3) | H1A···C8vi | 3.1454 |
O5···O3ii | 3.4039 (18) | H1A···H1Avi | 3.5908 |
O5···C4iv | 3.428 (3) | H1A···H8vi | 2.9387 |
O5···C13v | 3.417 (3) | H1A···H18Ai | 3.1954 |
C1···C2vi | 3.521 (3) | H1B···O3i | 3.4446 |
C1···C17i | 3.558 (3) | H1B···O5i | 3.3091 |
C2···C1vi | 3.521 (3) | H1B···C11i | 3.3634 |
C4···O5iv | 3.428 (3) | H1B···C16i | 3.2120 |
C4···C16iv | 3.428 (3) | H1B···C17i | 3.4654 |
C13···O5vii | 3.417 (3) | H1B···C21i | 3.1656 |
C15···O1viii | 3.595 (3) | H1B···C22i | 3.2018 |
C16···C4iv | 3.428 (3) | H1B···H3Ai | 3.2729 |
C17···C1viii | 3.558 (3) | H1B···H14Aiv | 3.3723 |
C19···O4ix | 3.272 (3) | H1B···H15Ai | 3.3772 |
O1···H3 | 2.6295 | H1B···H18Ai | 3.4114 |
O1···H8 | 2.390 (14) | H1B···H20Bi | 3.3308 |
O2···H4A | 1.8023 | H1C···O2i | 2.9723 |
O2···H8 | 2.893 (15) | H1C···O4i | 3.4764 |
O2···H18A | 2.7740 | H1C···C2vi | 3.5878 |
O2···H18B | 2.4700 | H1C···C11i | 3.3161 |
O3···H10 | 2.4282 | H1C···C12i | 3.2985 |
O3···H20A | 2.4779 | H1C···C17i | 2.8440 |
O3···H20B | 2.6713 | H1C···C18i | 3.3703 |
O4···H9 | 2.835 (17) | H1C···C22i | 3.1582 |
O4···H13A | 2.4733 | H1C···H4Ai | 3.2039 |
O4···H13B | 2.7005 | H1C···H13Bi | 3.5103 |
O5···H3A | 1.8483 | H1C···H18Ai | 2.8820 |
O5···H10 | 2.4540 | H3···O2vi | 3.5452 |
O5···H15A | 2.7329 | H3···C18vi | 3.1780 |
O5···H15B | 2.4876 | H3···H14Aiv | 2.8866 |
C1···H3 | 2.5202 | H3···H18Bvi | 2.3650 |
C2···H1A | 2.6034 | H3···H19Bvi | 3.2350 |
C2···H1B | 2.6535 | H3A···O3ii | 2.8477 |
C2···H1C | 3.1862 | H3A···H1Bviii | 3.2729 |
C2···H4 | 3.2307 | H3A···H3Aii | 2.9488 |
C2···H6 | 3.2298 | H3A···H5iv | 3.4928 |
C2···H8 | 2.626 (15) | H3A···H13Av | 3.4020 |
C3···H1A | 2.7126 | H4···O5iv | 2.9416 |
C3···H1B | 2.8037 | H4···C15iv | 3.4312 |
C3···H5 | 3.2300 | H4···C16iv | 3.1300 |
C4···H6 | 3.2099 | H4···C18vi | 3.5086 |
C5···H3 | 3.2255 | H4···C19vi | 3.1730 |
C6···H4 | 3.2162 | H4···C20xi | 3.3690 |
C6···H8 | 3.294 (15) | H4···H14Aiv | 3.5105 |
C6···H9 | 2.809 (16) | H4···H15Biv | 2.9262 |
C7···H3 | 3.2601 | H4···H18Bvi | 2.8985 |
C7···H5 | 3.2616 | H4···H19Avi | 2.8654 |
C7···H9 | 2.694 (16) | H4···H19Bvi | 2.8224 |
C8···H4A | 3.1867 | H4···H20Axi | 2.5151 |
C8···H6 | 2.6746 | H4···H20Bxi | 3.4074 |
C8···H10 | 2.9324 | H4A···C19iii | 3.4414 |
C9···H4A | 2.5271 | H4A···C20iii | 3.5808 |
C9···H6 | 2.7961 | H4A···H1Cviii | 3.2039 |
C10···H3A | 2.4763 | H4A···H18Aiii | 3.0575 |
C10···H4A | 2.5403 | H4A···H19Aiii | 2.8330 |
C10···H8 | 2.662 (14) | H4A···H20Biii | 2.8906 |
C11···H3A | 2.9679 | H5···O3xi | 3.0571 |
C11···H4A | 2.3780 | H5···O5iv | 3.3769 |
C11···H9 | 2.631 (16) | H5···C10iv | 3.5801 |
C11···H13A | 3.2271 | H5···C14vii | 3.4339 |
C11···H13B | 3.0252 | H5···C20xi | 3.3566 |
C11···H14A | 3.0235 | H5···H3Aiv | 3.4928 |
C11···H15A | 3.0236 | H5···H10iv | 2.7005 |
C11···H15B | 3.2498 | H5···H14Avii | 3.5555 |
C12···H9 | 2.889 (16) | H5···H14Bvii | 2.5446 |
C12···H10 | 3.2647 | H5···H20Axi | 2.9903 |
C12···H14A | 2.7721 | H5···H20Bxi | 3.0067 |
C12···H14B | 3.3185 | H6···C9iv | 3.5698 |
C12···H15A | 3.2309 | H6···C14vii | 3.3192 |
C13···H4A | 3.0282 | H6···C15vii | 3.1913 |
C13···H15A | 2.7395 | H6···H9iv | 3.2824 |
C13···H15B | 3.3097 | H6···H14Bvii | 2.6633 |
C15···H13A | 3.3091 | H6···H15Avii | 3.0262 |
C15···H13B | 2.7458 | H6···H15Bvii | 2.7899 |
C16···H3A | 2.6923 | H6···H18Aiii | 2.9252 |
C16···H10 | 2.5172 | H6···H18Biii | 3.3928 |
C16···H13B | 3.2591 | H8···C13i | 3.470 (15) |
C16···H14A | 2.7721 | H8···H1Avi | 2.9387 |
C16···H14B | 3.3296 | H8···H13Bi | 2.5419 |
C17···H4A | 2.6467 | H8···H15Ai | 3.3368 |
C17···H8 | 2.680 (15) | H9···C5iv | 3.536 (19) |
C17···H10 | 3.2916 | H9···C6iv | 3.181 (19) |
C17···H19A | 3.3245 | H9···C7iv | 3.448 (19) |
C17···H19B | 2.7239 | H9···H6iv | 3.2824 |
C17···H20B | 3.2846 | H9···H15Avii | 3.2033 |
C18···H20A | 3.2862 | H9···H15Bvii | 3.4048 |
C18···H20B | 2.7145 | H10···C4iv | 3.5768 |
C20···H3A | 3.0298 | H10···C5iv | 2.9791 |
C20···H18A | 2.6689 | H10···C6iv | 3.5256 |
C20···H18B | 3.2925 | H10···H5iv | 2.7005 |
C21···H8 | 3.502 (15) | H10···H13Bi | 3.4366 |
C21···H10 | 2.4969 | H10···H14Bi | 2.8717 |
C21···H18A | 3.1320 | H13A···O3viii | 3.1455 |
C21···H19A | 3.3218 | H13A···O5vii | 2.5517 |
C21···H19B | 2.7781 | H13A···C20viii | 3.4621 |
C22···H3A | 2.3781 | H13A···C21viii | 3.2451 |
C22···H4A | 2.9304 | H13A···H3Avii | 3.4020 |
C22···H8 | 2.574 (14) | H13A···H15Bvii | 3.4506 |
C22···H9 | 3.382 (17) | H13A···H19Aiii | 3.4546 |
C22···H18A | 2.9800 | H13A···H19Bviii | 3.5436 |
C22···H18B | 3.2603 | H13A···H20Aviii | 2.9036 |
C22···H19B | 2.9905 | H13B···O1viii | 3.0081 |
C22···H20A | 3.2202 | H13B···C8viii | 3.1204 |
C22···H20B | 3.0637 | H13B···C21viii | 3.2631 |
H1A···H3 | 2.2690 | H13B···C22viii | 3.3789 |
H1B···H3 | 2.3646 | H13B···H1Cviii | 3.5103 |
H1C···H3 | 3.4728 | H13B···H8viii | 2.5419 |
H3···H4 | 2.3031 | H13B···H10viii | 3.4366 |
H3A···H10 | 1.9610 | H13B···H19Bviii | 2.9943 |
H3A···H20A | 3.2743 | H13B···H20Aviii | 3.4126 |
H3A···H20B | 3.3049 | H14A···O5vii | 3.3092 |
H4···H5 | 2.3014 | H14A···C3iv | 3.1507 |
H4A···H8 | 3.4579 | H14A···C4iv | 3.5164 |
H4A···H9 | 2.7158 | H14A···H1Biv | 3.3723 |
H4A···H10 | 3.5005 | H14A···H3iv | 2.8866 |
H4A···H13A | 3.2681 | H14A···H4iv | 3.5105 |
H4A···H13B | 3.3016 | H14A···H5v | 3.5555 |
H5···H6 | 2.3077 | H14A···H18Bxiv | 3.3802 |
H6···H8 | 3.5527 | H14B···C5v | 3.1512 |
H6···H9 | 2.3176 | H14B···C6v | 3.2197 |
H8···H9 | 2.77 (3) | H14B···C9viii | 3.5664 |
H8···H10 | 3.0491 | H14B···H5v | 2.5446 |
H8···H19B | 3.2466 | H14B···H6v | 2.6633 |
H9···H10 | 2.4876 | H14B···H10viii | 2.8717 |
H13A···H14A | 2.2890 | H15A···O1viii | 2.8504 |
H13A···H14B | 2.3826 | H15A···C2viii | 3.0500 |
H13B···H14A | 2.8184 | H15A···C7viii | 3.1974 |
H13B···H14B | 2.2847 | H15A···C8viii | 3.2285 |
H13B···H15A | 2.6544 | H15A···H1Bviii | 3.3772 |
H14A···H15A | 2.8224 | H15A···H6v | 3.0262 |
H14A···H15B | 2.2972 | H15A···H8viii | 3.3368 |
H14B···H15A | 2.2932 | H15A···H9v | 3.2033 |
H14B···H15B | 2.3813 | H15B···O4v | 3.4160 |
H18A···H19A | 2.3178 | H15B···C4iv | 3.5109 |
H18A···H19B | 2.8261 | H15B···C18xiv | 3.5102 |
H18A···H20A | 3.5710 | H15B···H4iv | 2.9262 |
H18A···H20B | 2.5737 | H15B···H6v | 2.7899 |
H18B···H19A | 2.3578 | H15B···H9v | 3.4048 |
H18B···H19B | 2.3246 | H15B···H13Av | 3.4506 |
H18B···H20B | 3.5909 | H15B···H18Axiv | 3.4073 |
H19A···H20A | 2.3907 | H15B···H18Bxiv | 2.8571 |
H19A···H20B | 2.2891 | H15B···H19Axiv | 3.4726 |
H19B···H20A | 2.2973 | H18A···O2ix | 3.5903 |
H19B···H20B | 2.8231 | H18A···O4ix | 3.1696 |
O1···H1Avi | 3.0828 | H18A···C1viii | 3.3400 |
O1···H13Bi | 3.0081 | H18A···C6ix | 3.2131 |
O1···H15Ai | 2.8504 | H18A···H1Aviii | 3.1954 |
O2···H1Avi | 3.3695 | H18A···H1Bviii | 3.4114 |
O2···H1Cviii | 2.9723 | H18A···H1Cviii | 2.8820 |
O2···H3vi | 3.5452 | H18A···H4Aix | 3.0575 |
O2···H18Aiii | 3.5903 | H18A···H6ix | 2.9252 |
O2···H20Biii | 2.6927 | H18A···H15Bxii | 3.4073 |
O3···H1Bviii | 3.4446 | H18B···C3vi | 3.1087 |
O3···H3Aii | 2.8477 | H18B···C4vi | 3.3700 |
O3···H5x | 3.0571 | H18B···H3vi | 2.3650 |
O3···H13Ai | 3.1455 | H18B···H4vi | 2.8985 |
O4···H1Cviii | 3.4764 | H18B···H6ix | 3.3928 |
O4···H15Bvii | 3.4160 | H18B···H14Axii | 3.3802 |
O4···H18Aiii | 3.1696 | H18B···H15Bxii | 2.8571 |
O4···H19Aiii | 2.4938 | H19A···O4ix | 2.4938 |
O4···H20Biii | 3.1709 | H19A···C19xiii | 3.3752 |
O5···H1Bviii | 3.3091 | H19A···C20xiii | 3.4272 |
O5···H4iv | 2.9416 | H19A···H4vi | 2.8654 |
O5···H5iv | 3.3769 | H19A···H4Aix | 2.8330 |
O5···H13Av | 2.5517 | H19A···H13Aix | 3.4546 |
O5···H14Av | 3.3092 | H19A···H15Bxii | 3.4726 |
C1···H18Ai | 3.3400 | H19A···H19Axiii | 3.1627 |
C2···H1Avi | 2.8827 | H19A···H19Bxiii | 3.0665 |
C2···H1Cvi | 3.5878 | H19A···H20Axiii | 2.6815 |
C2···H15Ai | 3.0500 | H19B···C3vi | 3.5619 |
C3···H1Avi | 3.5331 | H19B···C4vi | 3.3424 |
C3···H14Aiv | 3.1507 | H19B···H3vi | 3.2350 |
C3···H18Bvi | 3.1087 | H19B···H4vi | 2.8224 |
C3···H19Bvi | 3.5619 | H19B···H13Ai | 3.5436 |
C4···H10iv | 3.5768 | H19B···H13Bi | 2.9943 |
C4···H14Aiv | 3.5164 | H19B···H19Axiii | 3.0665 |
C4···H15Biv | 3.5109 | H19B···H20Axiii | 3.0827 |
C4···H18Bvi | 3.3700 | H20A···C4x | 3.1710 |
C4···H19Bvi | 3.3424 | H20A···C5x | 3.4057 |
C4···H20Axi | 3.1710 | H20A···C13i | 3.5946 |
C5···H9iv | 3.536 (19) | H20A···C19xiii | 3.3249 |
C5···H10iv | 2.9791 | H20A···H4x | 2.5151 |
C5···H14Bvii | 3.1512 | H20A···H5x | 2.9903 |
C5···H20Axi | 3.4057 | H20A···H13Ai | 2.9036 |
C5···H20Bxi | 3.5141 | H20A···H13Bi | 3.4126 |
C6···H1Avi | 3.5387 | H20A···H19Axiii | 2.6815 |
C6···H9iv | 3.181 (19) | H20A···H19Bxiii | 3.0827 |
C6···H10iv | 3.5256 | H20B···O2ix | 2.6927 |
C6···H14Bvii | 3.2197 | H20B···O4ix | 3.1709 |
C6···H18Aiii | 3.2131 | H20B···C5x | 3.5141 |
C7···H1Avi | 2.8961 | H20B···H1Bviii | 3.3308 |
C7···H9iv | 3.448 (19) | H20B···H4x | 3.4074 |
C7···H15Ai | 3.1974 | H20B···H4Aix | 2.8906 |
C8···H1Avi | 3.1454 | H20B···H5x | 3.0067 |
C1—O1—C2 | 118.76 (13) | H1B—C1—H1C | 109.479 |
O1—C2—C3 | 123.88 (13) | C2—C3—H3 | 119.939 |
O1—C2—C7 | 115.66 (13) | C4—C3—H3 | 119.939 |
C3—C2—C7 | 120.46 (14) | C3—C4—H4 | 119.629 |
C2—C3—C4 | 120.12 (15) | C5—C4—H4 | 119.623 |
C3—C4—C5 | 120.75 (16) | C4—C5—H5 | 120.477 |
C4—C5—C6 | 119.06 (15) | C6—C5—H5 | 120.466 |
C5—C6—C7 | 122.10 (14) | C5—C6—H6 | 118.958 |
C2—C7—C6 | 117.51 (13) | C7—C6—H6 | 118.945 |
C2—C7—C8 | 119.33 (13) | C7—C8—H8 | 115.8 (9) |
C6—C7—C8 | 123.08 (12) | C9—C8—H8 | 117.0 (9) |
C7—C8—C9 | 127.10 (14) | C8—C9—H9 | 119.3 (10) |
C8—C9—C10 | 125.51 (14) | C10—C9—H9 | 115.1 (10) |
C9—C10—C11 | 112.43 (11) | C9—C10—H10 | 104.489 |
C9—C10—C22 | 113.82 (11) | C11—C10—H10 | 104.490 |
C11—C10—C22 | 115.61 (12) | C22—C10—H10 | 104.498 |
C10—C11—C12 | 122.53 (13) | C12—C13—H13A | 109.122 |
C10—C11—C16 | 118.62 (13) | C12—C13—H13B | 109.121 |
C12—C11—C16 | 118.75 (13) | C14—C13—H13A | 109.120 |
O4—C12—C11 | 122.89 (13) | C14—C13—H13B | 109.119 |
O4—C12—C13 | 114.90 (15) | H13A—C13—H13B | 107.853 |
C11—C12—C13 | 122.20 (15) | C13—C14—H14A | 109.586 |
C12—C13—C14 | 112.40 (15) | C13—C14—H14B | 109.587 |
C13—C14—C15 | 110.32 (15) | C15—C14—H14A | 109.592 |
C14—C15—C16 | 112.19 (15) | C15—C14—H14B | 109.587 |
O5—C16—C11 | 122.86 (13) | H14A—C14—H14B | 108.131 |
O5—C16—C15 | 116.05 (14) | C14—C15—H15A | 109.166 |
C11—C16—C15 | 121.08 (15) | C14—C15—H15B | 109.165 |
O2—C17—C18 | 116.30 (16) | C16—C15—H15A | 109.164 |
O2—C17—C22 | 123.05 (15) | C16—C15—H15B | 109.166 |
C18—C17—C22 | 120.64 (14) | H15A—C15—H15B | 107.891 |
C17—C18—C19 | 111.76 (16) | C17—C18—H18A | 109.268 |
C18—C19—C20 | 108.65 (14) | C17—C18—H18B | 109.261 |
C19—C20—C21 | 112.65 (15) | C19—C18—H18A | 109.270 |
O3—C21—C20 | 114.76 (14) | C19—C18—H18B | 109.262 |
O3—C21—C22 | 122.93 (15) | H18A—C18—H18B | 107.941 |
C20—C21—C22 | 122.31 (16) | C18—C19—H19A | 109.957 |
C10—C22—C17 | 122.56 (13) | C18—C19—H19B | 109.959 |
C10—C22—C21 | 119.72 (14) | C20—C19—H19A | 109.965 |
C17—C22—C21 | 117.58 (14) | C20—C19—H19B | 109.962 |
C21—O3—H3A | 109.468 | H19A—C19—H19B | 108.341 |
C12—O4—H4A | 109.461 | C19—C20—H20A | 109.067 |
O1—C1—H1A | 109.469 | C19—C20—H20B | 109.070 |
O1—C1—H1B | 109.475 | C21—C20—H20A | 109.054 |
O1—C1—H1C | 109.465 | C21—C20—H20B | 109.061 |
H1A—C1—H1B | 109.469 | H20A—C20—H20B | 107.825 |
H1A—C1—H1C | 109.470 | ||
C1—O1—C2—C3 | 0.5 (3) | C10—C11—C12—C13 | 172.78 (13) |
C1—O1—C2—C7 | −178.50 (14) | C10—C11—C16—O5 | 7.5 (3) |
O1—C2—C3—C4 | −178.93 (15) | C10—C11—C16—C15 | −173.79 (12) |
O1—C2—C7—C6 | 178.35 (13) | C12—C11—C16—O5 | −169.16 (15) |
O1—C2—C7—C8 | 1.5 (3) | C12—C11—C16—C15 | 9.5 (3) |
C3—C2—C7—C6 | −0.7 (3) | C16—C11—C12—O4 | 167.84 (15) |
C3—C2—C7—C8 | −177.51 (15) | C16—C11—C12—C13 | −10.7 (3) |
C7—C2—C3—C4 | 0.0 (3) | O4—C12—C13—C14 | 161.33 (14) |
C2—C3—C4—C5 | 0.8 (3) | C11—C12—C13—C14 | −20.0 (3) |
C3—C4—C5—C6 | −1.0 (4) | C12—C13—C14—C15 | 50.1 (2) |
C4—C5—C6—C7 | 0.3 (3) | C13—C14—C15—C16 | −51.0 (2) |
C5—C6—C7—C2 | 0.5 (3) | C14—C15—C16—O5 | −159.17 (16) |
C5—C6—C7—C8 | 177.25 (16) | C14—C15—C16—C11 | 22.0 (3) |
C2—C7—C8—C9 | −162.38 (15) | O2—C17—C18—C19 | −153.73 (12) |
C6—C7—C8—C9 | 21.0 (3) | O2—C17—C22—C10 | 6.0 (2) |
C7—C8—C9—C10 | 179.16 (14) | O2—C17—C22—C21 | −169.71 (12) |
C8—C9—C10—C11 | 153.67 (15) | C18—C17—C22—C10 | −175.32 (12) |
C8—C9—C10—C22 | 19.8 (3) | C18—C17—C22—C21 | 9.0 (2) |
C9—C10—C11—C12 | −43.38 (19) | C22—C17—C18—C19 | 27.47 (19) |
C9—C10—C11—C16 | 140.09 (13) | C17—C18—C19—C20 | −55.86 (18) |
C9—C10—C22—C17 | 53.17 (17) | C18—C19—C20—C21 | 50.0 (2) |
C9—C10—C22—C21 | −131.23 (12) | C19—C20—C21—O3 | 164.22 (14) |
C11—C10—C22—C17 | −79.22 (15) | C19—C20—C21—C22 | −15.3 (3) |
C11—C10—C22—C21 | 96.37 (15) | O3—C21—C22—C10 | −10.8 (2) |
C22—C10—C11—C12 | 89.66 (16) | O3—C21—C22—C17 | 165.03 (13) |
C22—C10—C11—C16 | −86.88 (16) | C20—C21—C22—C10 | 168.73 (13) |
C10—C11—C12—O4 | −8.7 (3) | C20—C21—C22—C17 | −15.5 (2) |
Symmetry codes: (i) x−1/2, −y+1/2, z−1/2; (ii) −x+1, −y+1, −z; (iii) −x+1/2, y−1/2, −z+1/2; (iv) −x+1, −y, −z; (v) −x+3/2, y+1/2, −z+1/2; (vi) −x, −y, −z; (vii) −x+3/2, y−1/2, −z+1/2; (viii) x+1/2, −y+1/2, z+1/2; (ix) −x+1/2, y+1/2, −z+1/2; (x) x, y+1, z; (xi) x, y−1, z; (xii) x−1, y, z; (xiii) −x, −y+1, −z; (xiv) x+1, y, z. |
D—H···A | D—H | H···A | D···A | D—H···A |
O3—H3A···O5 | 0.82 | 1.85 | 2.644 (3) | 163 |
O4—H4A···O2 | 0.82 | 1.80 | 2.594 (3) | 162 |
C19—H19A···O4ix | 0.97 | 2.49 | 3.272 (3) | 137 |
Symmetry code: (ix) −x+1/2, y+1/2, −z+1/2. |
Experimental details
Crystal data | |
Chemical formula | C22H24O5 |
Mr | 368.43 |
Crystal system, space group | Monoclinic, P21/n |
Temperature (K) | 297 |
a, b, c (Å) | 10.7988 (8), 12.0509 (8), 15.0238 (10) |
β (°) | 104.536 (2) |
V (Å3) | 1892.5 (3) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.09 |
Crystal size (mm) | 0.40 × 0.20 × 0.20 |
Data collection | |
Diffractometer | Rigaku R-AXIS RAPID |
Absorption correction | Multi-scan (ABSCOR; Rigaku, 1995) |
Tmin, Tmax | 0.715, 0.982 |
No. of measured, independent and observed [F2 > 2.0σ(F2)] reflections | 18125, 4304, 2465 |
Rint | 0.033 |
(sin θ/λ)max (Å−1) | 0.649 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.038, 0.119, 1.05 |
No. of reflections | 4304 |
No. of parameters | 255 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.18, −0.20 |
Computer programs: RAPID-AUTO (Rigaku, 2006), IL MILIONE (Burla et al., 2007), SHELXL97 (Sheldrick, 2008), CrystalStructure (Rigaku, 2010).
D—H···A | D—H | H···A | D···A | D—H···A |
O3—H3A···O5 | 0.820 | 1.848 | 2.644 (3) | 163.4 |
O4—H4A···O2 | 0.820 | 1.802 | 2.594 (3) | 161.9 |
C19—H19A···O4i | 0.970 | 2.494 | 3.272 (3) | 137.0 |
Symmetry code: (i) −x+1/2, y+1/2, −z+1/2. |
Acknowledgements
Fiancial support from the Korea Institute of Science and Technology (KIST) is gratefully acknowledged.
References
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This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
Xanthenes constitute an important class of organic compounds that have attracted strong interest due to their useful biological and pharmacological properties, such as antibacterial, antiviral and antiinflammatory activities (Jonathan et al., 1988). They also constitute a structural unit of a series of natural products (Delfourne et al., 2000). Also they are being developed to act as new clinical agents in cancer therapy (Koeller et al., 2003). Herewith we present the crystal structure of the title compound (I) (Fig. 1), which is a Xanthene derivative.
The molecular structure of xanthenedione features two cyclohexene rings, each has a half-chair conformation and lie above the respective least-squares plane through the remaining five carbon atoms (Palakshi Reddy et al., 2010). Bolte and colleagues determined the crystal structures of bis-dimedone derivatives which showed nearly the same packing pattern irrespective of the different substituent in the para position of the aromatic ring (Bolte et al., 2001). Two cyclohexenone rings in (I) display envelope conformation, and atoms C14 and C19 are directed towards the aromatic ring. The hydroxy and carbonyl O atoms face each other and are orientated to allow for the formation of two intramolecular O—H···O hydrogen bonds (Table 1) typical for Xanthene derivative.
In the crystal structure, weak intermolecular C—H···O hydrogen bonds (Table 1) links the molecules into layers parallel to ab plane.