organic compounds
2,4,6-Trinitrophenyl furan-2-carboxylate
aDepartamento de Química – Facultad de Ciencias, Universidad del Valle, Apartado 25360, Santiago de Cali, Colombia, and bWestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, Scotland
*Correspondence e-mail: rodimo26@yahoo.es
In the title carboxylate derivative, C11H5N3O9, the picryl ring forms an angle of 75.79 (7)° with the ester fragment, indicating a near perpendicular disposition. The nitro substituents are variously oriented with respect to the picryl ring [dihedral angles = 3.22 (10), 16.03 (12) and 36.63 (10)°]. In the crystal, molecules form helical chains sustained by C—H⋯O interactions along [010]. The furanyl residue is disordered, having two coplanar slightly displaced orientations [major component = 0.730 (9)].
CCDC reference: 966457
Related literature
For similar et al. (2012, 2013). For hydrogen bonding, see: Nardelli (1995).
see: Moreno-FuquenExperimental
Crystal data
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Data collection: CrysAlis PRO (Oxford Diffraction, 2010); cell CrysAlis PRO; data reduction: CrysAlis PRO; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012) and Mercury (Macrae et al., 2006); software used to prepare material for publication: WinGX (Farrugia, 2012).
Supporting information
CCDC reference: 966457
10.1107/S1600536813028274/tk5263sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536813028274/tk5263Isup2.hkl
Supporting information file. DOI: 10.1107/S1600536813028274/tk5263Isup3.cml
The reagents and solvents for the synthesis were obtained from the Aldrich Chemical Co., and were used without additional purification. The title molecule was synthesized using equimolar quantities of 2-furoyl chloride (0.252 g, 1.931 mmol) and picric acid (0.442 g). The reagents were dissolved in acetonitrile and the solution was taken to reflux for about an hour. A pale-yellow solid was obtained after leaving the solvent to evaporate. The solid was washed with distilled water and cold methanol to eliminate impurities. Crystals of good quality and suitable for single-crystal X-ray diffraction were grown from its acetonitrile solution. IR spectra were recorded on a FT—IR SHIMADZU IR-Affinity-1 spectrophotometer. Pale Yellow crystals; yield 52%; m.p 383 (1) K. IR (KBr) 3088.17 cm-1 (aromatic C—H); 1764.94 cm-1 (ester C=O); 1544.08 cm-1, 1343.48 cm-1 (–NO2); 1234.50 cm-1 (C(=O)—O).
Bond lengths of the disordered furanyl ring were restrained to 1.37 (1) Å for C—O and 1.325 (20) and 1.45 (2) Å for the formally double and single C—C bonds, respectively. Restraints were also applied to force equivalence of displacement parameters for each pair of disordered atoms. All H-atoms were positioned at geometrically idealized positions with C—H distances of 0.95 Å, and with Uiso(H) = 1.2Ueq of the parent C-atoms.
Data collection: CrysAlis PRO (Oxford Diffraction, 2010); cell
CrysAlis PRO (Oxford Diffraction, 2010); data reduction: CrysAlis PRO (Oxford Diffraction, 2010); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012) and Mercury (Macrae et al., 2006); software used to prepare material for publication: WinGX (Farrugia, 2012).C11H5N3O9 | Dx = 1.737 Mg m−3 |
Mr = 323.18 | Melting point: 435(1) K |
Orthorhombic, P212121 | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: P 2ac 2ab | Cell parameters from 4861 reflections |
a = 7.0982 (3) Å | θ = 3.0–27.0° |
b = 8.4931 (4) Å | µ = 0.16 mm−1 |
c = 20.4970 (9) Å | T = 123 K |
V = 1235.68 (10) Å3 | Block, pale-yellow |
Z = 4 | 0.35 × 0.22 × 0.11 mm |
F(000) = 656 |
Oxford Diffraction Xcalibur E diffractometer | 2395 reflections with I > 2σ(I) |
Radiation source: fine-focus sealed tube | Rint = 0.022 |
Graphite monochromator | θmax = 27.0°, θmin = 3.0° |
ω scans | h = −9→9 |
4861 measured reflections | k = −10→8 |
2669 independent reflections | l = −26→20 |
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)] = 0.039 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.095 | H-atom parameters constrained |
S = 1.06 | w = 1/[σ2(Fo2) + (0.0469P)2 + 0.1241P] where P = (Fo2 + 2Fc2)/3 |
2669 reflections | (Δ/σ)max < 0.001 |
224 parameters | Δρmax = 0.27 e Å−3 |
12 restraints | Δρmin = −0.27 e Å−3 |
C11H5N3O9 | V = 1235.68 (10) Å3 |
Mr = 323.18 | Z = 4 |
Orthorhombic, P212121 | Mo Kα radiation |
a = 7.0982 (3) Å | µ = 0.16 mm−1 |
b = 8.4931 (4) Å | T = 123 K |
c = 20.4970 (9) Å | 0.35 × 0.22 × 0.11 mm |
Oxford Diffraction Xcalibur E diffractometer | 2395 reflections with I > 2σ(I) |
4861 measured reflections | Rint = 0.022 |
2669 independent reflections |
R[F2 > 2σ(F2)] = 0.039 | 12 restraints |
wR(F2) = 0.095 | H-atom parameters constrained |
S = 1.06 | Δρmax = 0.27 e Å−3 |
2669 reflections | Δρmin = −0.27 e Å−3 |
224 parameters |
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. |
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > σ(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger. |
x | y | z | Uiso*/Ueq | Occ. (<1) | |
O1 | −0.18433 (19) | 0.8534 (2) | 0.26898 (7) | 0.0305 (4) | |
O2 | −0.1529 (2) | 0.8749 (2) | 0.37311 (8) | 0.0363 (5) | |
O3 | 0.4160 (2) | 0.7394 (3) | 0.48267 (7) | 0.0428 (5) | |
O4 | 0.6111 (2) | 0.5845 (2) | 0.43352 (8) | 0.0375 (4) | |
O5 | 0.5765 (2) | 0.53627 (19) | 0.19586 (8) | 0.0293 (4) | |
O6 | 0.4404 (2) | 0.7359 (2) | 0.15032 (7) | 0.0401 (5) | |
O7 | 0.08707 (19) | 0.73046 (16) | 0.19797 (6) | 0.0204 (3) | |
O8 | 0.11722 (19) | 0.99352 (16) | 0.18492 (7) | 0.0215 (3) | |
N1 | −0.0930 (2) | 0.8411 (2) | 0.31894 (8) | 0.0215 (4) | |
N2 | 0.4759 (2) | 0.6722 (2) | 0.43417 (8) | 0.0253 (4) | |
N3 | 0.4676 (2) | 0.6478 (2) | 0.19627 (8) | 0.0225 (4) | |
C1 | 0.1840 (3) | 0.7368 (2) | 0.25609 (9) | 0.0164 (4) | |
C2 | 0.1026 (3) | 0.7816 (2) | 0.31521 (9) | 0.0178 (4) | |
C3 | 0.1979 (3) | 0.7648 (3) | 0.37363 (10) | 0.0194 (4) | |
H3 | 0.1425 | 0.7973 | 0.4136 | 0.023* | |
C4 | 0.3760 (3) | 0.6994 (2) | 0.37219 (9) | 0.0199 (4) | |
C5 | 0.4643 (3) | 0.6543 (2) | 0.31504 (9) | 0.0188 (4) | |
H5 | 0.5859 | 0.6077 | 0.3153 | 0.023* | |
C6 | 0.3678 (3) | 0.6802 (2) | 0.25754 (9) | 0.0182 (4) | |
C7 | 0.0627 (3) | 0.8691 (2) | 0.16480 (9) | 0.0169 (4) | |
C8A | −0.032 (7) | 0.8401 (19) | 0.1031 (12) | 0.020 (2) | 0.730 (9) |
O9A | −0.0526 (9) | 0.9683 (6) | 0.0630 (3) | 0.0319 (8) | 0.730 (9) |
C9A | −0.1062 (9) | 0.7071 (7) | 0.0776 (2) | 0.0194 (10) | 0.730 (9) |
H9 | −0.1115 | 0.6058 | 0.0972 | 0.023* | 0.730 (9) |
C10A | −0.1754 (5) | 0.7519 (7) | 0.0143 (2) | 0.0298 (12) | 0.730 (9) |
H10 | −0.2333 | 0.6848 | −0.0169 | 0.036* | 0.730 (9) |
C11A | −0.1425 (7) | 0.9074 (7) | 0.0077 (2) | 0.0316 (11) | 0.730 (9) |
H11 | −0.1758 | 0.9678 | −0.0296 | 0.038* | 0.730 (9) |
C8B | −0.044 (19) | 0.835 (5) | 0.105 (3) | 0.020 (2) | 0.270 (9) |
O9B | −0.077 (3) | 0.9350 (19) | 0.0532 (8) | 0.0319 (8) | 0.270 (9) |
C9B | −0.103 (3) | 0.687 (2) | 0.0960 (7) | 0.0194 (10) | 0.270 (9) |
H9B | −0.0902 | 0.5978 | 0.1238 | 0.023* | 0.270 (9) |
C10B | −0.1880 (18) | 0.6968 (18) | 0.0363 (6) | 0.0298 (12) | 0.270 (9) |
H10B | −0.2524 | 0.6115 | 0.0163 | 0.036* | 0.270 (9) |
C11B | −0.171 (2) | 0.840 (2) | 0.0088 (7) | 0.0316 (11) | 0.270 (9) |
H11B | −0.2151 | 0.8698 | −0.0332 | 0.038* | 0.270 (9) |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0175 (7) | 0.0428 (11) | 0.0313 (8) | 0.0018 (8) | −0.0020 (6) | 0.0103 (8) |
O2 | 0.0285 (8) | 0.0485 (12) | 0.0320 (9) | 0.0119 (8) | 0.0068 (7) | −0.0089 (9) |
O3 | 0.0451 (10) | 0.0646 (13) | 0.0187 (8) | 0.0105 (11) | −0.0038 (7) | −0.0073 (9) |
O4 | 0.0357 (9) | 0.0426 (11) | 0.0341 (9) | 0.0117 (9) | −0.0114 (8) | 0.0043 (8) |
O5 | 0.0273 (7) | 0.0241 (8) | 0.0364 (9) | 0.0105 (7) | 0.0031 (7) | −0.0032 (7) |
O6 | 0.0455 (10) | 0.0491 (11) | 0.0256 (8) | 0.0213 (10) | 0.0083 (7) | 0.0133 (9) |
O7 | 0.0236 (7) | 0.0165 (7) | 0.0212 (7) | 0.0004 (6) | −0.0081 (6) | −0.0001 (6) |
O8 | 0.0218 (7) | 0.0184 (8) | 0.0243 (8) | −0.0004 (6) | −0.0002 (7) | −0.0004 (7) |
N1 | 0.0178 (8) | 0.0186 (8) | 0.0280 (9) | −0.0005 (7) | 0.0033 (7) | 0.0012 (9) |
N2 | 0.0263 (10) | 0.0300 (11) | 0.0196 (9) | −0.0045 (8) | −0.0051 (7) | 0.0023 (9) |
N3 | 0.0205 (8) | 0.0255 (10) | 0.0215 (9) | 0.0041 (8) | −0.0007 (7) | −0.0002 (8) |
C1 | 0.0185 (9) | 0.0115 (10) | 0.0191 (9) | −0.0028 (8) | −0.0032 (8) | 0.0023 (8) |
C2 | 0.0148 (8) | 0.0128 (9) | 0.0257 (10) | −0.0009 (7) | 0.0016 (8) | 0.0030 (8) |
C3 | 0.0214 (10) | 0.0171 (10) | 0.0198 (9) | −0.0040 (8) | 0.0033 (8) | −0.0019 (9) |
C4 | 0.0209 (9) | 0.0180 (11) | 0.0208 (10) | −0.0039 (8) | −0.0048 (8) | 0.0027 (8) |
C5 | 0.0158 (8) | 0.0159 (9) | 0.0247 (10) | −0.0013 (7) | −0.0035 (8) | 0.0022 (10) |
C6 | 0.0192 (9) | 0.0154 (10) | 0.0200 (10) | −0.0006 (8) | 0.0018 (8) | 0.0010 (8) |
C7 | 0.0127 (8) | 0.0189 (11) | 0.0191 (9) | 0.0027 (8) | 0.0016 (7) | 0.0009 (8) |
C8A | 0.017 (6) | 0.0232 (14) | 0.0196 (17) | 0.0038 (12) | 0.002 (3) | 0.0022 (11) |
O9A | 0.039 (2) | 0.032 (3) | 0.025 (2) | 0.0024 (17) | −0.0090 (14) | −0.0029 (16) |
C9A | 0.0214 (10) | 0.018 (2) | 0.018 (3) | 0.0009 (13) | −0.009 (2) | −0.004 (2) |
C10A | 0.0299 (14) | 0.036 (3) | 0.023 (3) | 0.002 (2) | −0.0067 (18) | −0.005 (2) |
C11A | 0.034 (2) | 0.042 (3) | 0.0184 (14) | 0.006 (2) | −0.0097 (13) | −0.001 (2) |
C8B | 0.017 (6) | 0.0232 (14) | 0.0196 (17) | 0.0038 (12) | 0.002 (3) | 0.0022 (11) |
O9B | 0.039 (2) | 0.032 (3) | 0.025 (2) | 0.0024 (17) | −0.0090 (14) | −0.0029 (16) |
C9B | 0.0214 (10) | 0.018 (2) | 0.018 (3) | 0.0009 (13) | −0.009 (2) | −0.004 (2) |
C10B | 0.0299 (14) | 0.036 (3) | 0.023 (3) | 0.002 (2) | −0.0067 (18) | −0.005 (2) |
C11B | 0.034 (2) | 0.042 (3) | 0.0184 (14) | 0.006 (2) | −0.0097 (13) | −0.001 (2) |
O1—N1 | 1.216 (2) | C5—H5 | 0.9500 |
O2—N1 | 1.223 (2) | C7—C8A | 1.453 (7) |
O3—N2 | 1.223 (2) | C7—C8B | 1.471 (17) |
O4—N2 | 1.215 (2) | C8A—C9A | 1.352 (7) |
O5—N3 | 1.223 (2) | C8A—O9A | 1.372 (6) |
O6—N3 | 1.218 (2) | O9A—C11A | 1.400 (5) |
O7—C7 | 1.371 (2) | C9A—C10A | 1.439 (5) |
O7—C1 | 1.377 (2) | C9A—H9 | 0.9500 |
O8—C7 | 1.198 (2) | C10A—C11A | 1.348 (5) |
N1—C2 | 1.479 (2) | C10A—H10 | 0.9500 |
N2—C4 | 1.473 (2) | C11A—H11 | 0.9500 |
N3—C6 | 1.468 (2) | C8B—C9B | 1.345 (18) |
C1—C6 | 1.391 (3) | C8B—O9B | 1.376 (10) |
C1—C2 | 1.395 (3) | O9B—C11B | 1.388 (9) |
C2—C3 | 1.383 (3) | C9B—C10B | 1.365 (12) |
C3—C4 | 1.381 (3) | C9B—H9B | 0.9500 |
C3—H3 | 0.9500 | C10B—C11B | 1.344 (13) |
C4—C5 | 1.383 (3) | C10B—H10B | 0.9500 |
C5—C6 | 1.381 (3) | C11B—H11B | 0.9500 |
C7—O7—C1 | 117.29 (15) | O7—C7—C8A | 110.1 (4) |
O1—N1—O2 | 123.95 (16) | O8—C7—C8B | 128.7 (12) |
O1—N1—C2 | 119.09 (16) | O7—C7—C8B | 108.1 (10) |
O2—N1—C2 | 116.96 (16) | C9A—C8A—O9A | 113.0 (5) |
O4—N2—O3 | 124.75 (18) | C9A—C8A—C7 | 131.2 (6) |
O4—N2—C4 | 117.84 (17) | O9A—C8A—C7 | 115.8 (6) |
O3—N2—C4 | 117.40 (18) | C8A—O9A—C11A | 103.9 (5) |
O6—N3—O5 | 124.81 (17) | C8A—C9A—C10A | 105.1 (4) |
O6—N3—C6 | 118.03 (17) | C8A—C9A—H9 | 127.5 |
O5—N3—C6 | 117.13 (17) | C10A—C9A—H9 | 127.5 |
O7—C1—C6 | 118.28 (17) | C11A—C10A—C9A | 106.9 (4) |
O7—C1—C2 | 123.73 (17) | C11A—C10A—H10 | 126.6 |
C6—C1—C2 | 117.64 (17) | C9A—C10A—H10 | 126.6 |
C3—C2—C1 | 121.45 (17) | C10A—C11A—O9A | 111.1 (4) |
C3—C2—N1 | 116.71 (17) | C10A—C11A—H11 | 124.5 |
C1—C2—N1 | 121.77 (17) | O9A—C11A—H11 | 124.5 |
C4—C3—C2 | 118.07 (18) | C9B—C8B—O9B | 114.8 (15) |
C4—C3—H3 | 121.0 | C9B—C8B—C7 | 117.3 (16) |
C2—C3—H3 | 121.0 | O9B—C8B—C7 | 127.7 (18) |
C3—C4—C5 | 123.00 (18) | C8B—O9B—C11B | 103.2 (13) |
C3—C4—N2 | 119.04 (18) | C8B—C9B—C10B | 101.5 (13) |
C5—C4—N2 | 117.95 (17) | C8B—C9B—H9B | 129.3 |
C6—C5—C4 | 117.01 (16) | C10B—C9B—H9B | 129.3 |
C6—C5—H5 | 121.5 | C11B—C10B—C9B | 113.3 (13) |
C4—C5—H5 | 121.5 | C11B—C10B—H10B | 123.4 |
C5—C6—C1 | 122.59 (18) | C9B—C10B—H10B | 123.4 |
C5—C6—N3 | 117.46 (16) | C10B—C11B—O9B | 107.1 (13) |
C1—C6—N3 | 119.95 (17) | C10B—C11B—H11B | 126.5 |
O8—C7—O7 | 123.08 (17) | O9B—C11B—H11B | 126.5 |
O8—C7—C8A | 126.8 (4) | ||
C7—O7—C1—C6 | −105.5 (2) | C1—O7—C7—O8 | −1.9 (3) |
C7—O7—C1—C2 | 81.4 (2) | C1—O7—C7—C8A | 177 (2) |
O7—C1—C2—C3 | 170.67 (19) | C1—O7—C7—C8B | −180 (6) |
C6—C1—C2—C3 | −2.5 (3) | O8—C7—C8A—C9A | −176 (3) |
O7—C1—C2—N1 | −6.0 (3) | O7—C7—C8A—C9A | 5 (6) |
C6—C1—C2—N1 | −179.10 (17) | C8B—C7—C8A—C9A | −55 (71) |
O1—N1—C2—C3 | −177.87 (19) | O8—C7—C8A—O9A | 3 (5) |
O2—N1—C2—C3 | 2.0 (3) | O7—C7—C8A—O9A | −175 (3) |
O1—N1—C2—C1 | −1.1 (3) | C8B—C7—C8A—O9A | 125 (80) |
O2—N1—C2—C1 | 178.8 (2) | C9A—C8A—O9A—C11A | −2 (4) |
C1—C2—C3—C4 | −1.2 (3) | C7—C8A—O9A—C11A | 179 (3) |
N1—C2—C3—C4 | 175.64 (18) | O9A—C8A—C9A—C10A | 2 (4) |
C2—C3—C4—C5 | 1.8 (3) | C7—C8A—C9A—C10A | −178 (4) |
C2—C3—C4—N2 | −176.63 (19) | C8A—C9A—C10A—C11A | −2 (3) |
O4—N2—C4—C3 | 164.0 (2) | C9A—C10A—C11A—O9A | 0.8 (6) |
O3—N2—C4—C3 | −15.7 (3) | C8A—O9A—C11A—C10A | 0 (2) |
O4—N2—C4—C5 | −14.5 (3) | O8—C7—C8B—C9B | −174 (6) |
O3—N2—C4—C5 | 165.8 (2) | O7—C7—C8B—C9B | 4 (13) |
C3—C4—C5—C6 | 1.3 (3) | C8A—C7—C8B—C9B | 125 (87) |
N2—C4—C5—C6 | 179.71 (18) | O8—C7—C8B—O9B | 12 (18) |
C4—C5—C6—C1 | −5.2 (3) | O7—C7—C8B—O9B | −170 (11) |
C4—C5—C6—N3 | 173.92 (19) | C8A—C7—C8B—O9B | −49 (64) |
O7—C1—C6—C5 | −167.74 (19) | C9B—C8B—O9B—C11B | 2 (12) |
C2—C1—C6—C5 | 5.8 (3) | C7—C8B—O9B—C11B | 176 (11) |
O7—C1—C6—N3 | 13.2 (3) | O9B—C8B—C9B—C10B | −3 (12) |
C2—C1—C6—N3 | −173.29 (18) | C7—C8B—C9B—C10B | −178 (9) |
O6—N3—C6—C5 | −142.3 (2) | C8B—C9B—C10B—C11B | 4 (7) |
O5—N3—C6—C5 | 35.7 (3) | C9B—C10B—C11B—O9B | −3 (2) |
O6—N3—C6—C1 | 36.8 (3) | C8B—O9B—C11B—C10B | 1 (7) |
O5—N3—C6—C1 | −145.2 (2) |
D—H···A | D—H | H···A | D···A | D—H···A |
C5—H5···O8i | 0.95 | 2.32 | 3.270 (2) | 180 |
Symmetry code: (i) −x+1, y−1/2, −z+1/2. |
D—H···A | D—H | H···A | D···A | D—H···A |
C5—H5···O8i | 0.95 | 2.32 | 3.270 (2) | 180 |
Symmetry code: (i) −x+1, y−1/2, −z+1/2. |
Acknowledgements
RMF thanks the Universidad del Valle, Colombia, for partial financial support.
References
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In the present work, the structure of the 2,4,6-trinitrophenyl furan 2-carboxylate (I) has been determined as a part of an in-depth study of picryl substituted-esters carried out in our research group. Descriptions of similar structures have been published recently: 2,4,6-trinitrophenyl 3-chlorobenzoate (Moreno-Fuquen et al., 2013), and 2,4,6-trinitrophenyl benzoate (Moreno-Fuquen et al., 2012). The molecular structure of (I) is shown in Fig. 1. Bond distances and angles agree with the molecular features exhibited by other picryl substituted-esters, as described in detail in previous work (Moreno-Fuquen et al., 2012 and 2013). The picryl ring forms an angle of 75.79 (7)° with the ester fragment. The nitro groups form dihedral angles with the adjacent benzene ring of 3.22 (10), 16.03 (12) and 36.63 (10)° for O1—N1—O2, O3—N2—O4 and O5—N3—O6, respectively. The atoms at the furanyl ring are disordered over two positions with occupancies refined to 0.730 (9) and 0.270 (9) for C8A–C11A/O9A and C8B–C11B/O9B, respectively. Appropriate restraints were required (see experimental section) to give chemically acceptable geometries for these fragments. In the crystal the molecules are linked by weak C—H···O interactions, forming one-dimensional helical chains running along [010], as shown in Fig. 2 & Table 1. The C5 atom of the benzene ring at (x, y, z) acts as a hydrogen-bond donor to carbonyl atom O8 at (-x+1, +y-1/2, -z+1/2) (see Nardelli, 1995).