organic compounds
N-(3-Methylbenzoyl)-2-nitrobenzenesulfonamide
aDepartment of Chemistry, Mangalore University, Mangalagangotri 574 199, Mangalore, India, and bInstitute of Materials Science, Darmstadt University of Technology, Petersenstrasse 23, D-64287 Darmstadt, Germany
*Correspondence e-mail: gowdabt@yahoo.com
In the title compound, C14H12N2O5S, the conformation between the N—H group and the ortho-nitro group in the sulfonyl benzene ring is syn and that between the C=O and meta-methyl groups in the benzoyl ring is anti. The molecule is twisted at the S—N bond with a torsion angle of 64.3 (2)°. The dihedral angle between the sulfonyl benzene ring and the —SO2—NH—C—O segment is 75.73 (7)° and that between the sulfonyl and benzoyl benzene rings is 89.5 (1)°. The features inversion-related dimers linked by pairs of N—H⋯O(S) hydrogen bonds.
Related literature
For studies, including by our group, on the effects of substituents on the structures and other aspects of N-(aryl)-amides, see: Bowes et al. (2003); Gowda et al. (1999, 2003), on N-(aryl)-methanesulfonamides, see: Gowda et al. (2007), on N-(aryl)-arylsulfonamides, see: Shetty & Gowda (2005), on N-(substitutedbenzoyl)-arylsulfonamides, see: Suchetan et al. (2012), on N-chloroarylamides, see: Jyothi & Gowda (2004) and on N-bromoarylsulfonamides, see: Usha & Gowda (2006).
Experimental
Crystal data
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Refinement
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Data collection: CrysAlis CCD (Oxford Diffraction, 2009); cell CrysAlis RED (Oxford Diffraction, 2009); data reduction: CrysAlis RED; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: PLATON (Spek, 2009); software used to prepare material for publication: SHELXL97.
Supporting information
10.1107/S160053681200164X/bq2333sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: 10.1107/S160053681200164X/bq2333Isup2.hkl
Supporting information file. DOI: 10.1107/S160053681200164X/bq2333Isup3.cml
The title compound was prepared by refluxing a mixture of m-methylbenzoic acid (0.02 mole), 2-nitrobenzenesulfonamide (0.02 mole) and excess phosphorous oxychloride for 3 h on a water bath. The resultant mixture was cooled and poured into crushed ice. The solid, N-(3-methylbenzoyl)-2-nitrobenzenesulfonamide, obtained was filtered, washed thoroughly with water and then dissolved in sodium bicarbonate solution. The compound was later reprecipitated by acidifying the filtered solution with dilute HCl. It was filtered, dried and recrystallized.
Prism like colourless single crystals of the title compound used in X-ray diffraction studies were obtained by slow evaporation of its toluene solution at room temperature.
The H atom of the NH group was located in a difference map and later restrained to N—H = 0.86 (2) %A. The other H atoms were positioned with idealized geometry using a riding model with the aromatic C—H = 0.93 Å and the methyl C—H = 0.93 Å. All H atoms were refined with isotropic displacement parameters set at 1.2 Ueq(C-aromatic, N) and 1.5 Ueq(C-methyl).
Data collection: CrysAlis CCD (Oxford Diffraction, 2009); cell
CrysAlis RED (Oxford Diffraction, 2009); data reduction: CrysAlis RED (Oxford Diffraction, 2009); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: PLATON (Spek, 2009); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).C14H12N2O5S | F(000) = 1328 |
Mr = 320.32 | Dx = 1.478 Mg m−3 |
Orthorhombic, Pbca | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ac 2ab | Cell parameters from 2012 reflections |
a = 12.227 (1) Å | θ = 2.6–27.8° |
b = 12.854 (1) Å | µ = 0.25 mm−1 |
c = 18.317 (2) Å | T = 293 K |
V = 2878.8 (5) Å3 | Prism, colorless |
Z = 8 | 0.48 × 0.44 × 0.32 mm |
Oxford Diffraction Xcalibur diffractometer with a Sapphire CCD detector | 2936 independent reflections |
Radiation source: fine-focus sealed tube | 2306 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.019 |
Rotation method data acquisition using ω scans | θmax = 26.4°, θmin = 2.6° |
Absorption correction: multi-scan (CrysAlis RED; Oxford Diffraction, 2009) | h = −15→8 |
Tmin = 0.889, Tmax = 0.924 | k = −8→16 |
7423 measured reflections | l = −21→22 |
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)] = 0.044 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.124 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.04 | w = 1/[σ2(Fo2) + (0.0579P)2 + 1.5722P] where P = (Fo2 + 2Fc2)/3 |
2936 reflections | (Δ/σ)max = 0.001 |
203 parameters | Δρmax = 0.38 e Å−3 |
1 restraint | Δρmin = −0.33 e Å−3 |
C14H12N2O5S | V = 2878.8 (5) Å3 |
Mr = 320.32 | Z = 8 |
Orthorhombic, Pbca | Mo Kα radiation |
a = 12.227 (1) Å | µ = 0.25 mm−1 |
b = 12.854 (1) Å | T = 293 K |
c = 18.317 (2) Å | 0.48 × 0.44 × 0.32 mm |
Oxford Diffraction Xcalibur diffractometer with a Sapphire CCD detector | 2936 independent reflections |
Absorption correction: multi-scan (CrysAlis RED; Oxford Diffraction, 2009) | 2306 reflections with I > 2σ(I) |
Tmin = 0.889, Tmax = 0.924 | Rint = 0.019 |
7423 measured reflections |
R[F2 > 2σ(F2)] = 0.044 | 1 restraint |
wR(F2) = 0.124 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.04 | Δρmax = 0.38 e Å−3 |
2936 reflections | Δρmin = −0.33 e Å−3 |
203 parameters |
Experimental. CrysAlis RED (Oxford Diffraction, 2009) Empirical absorption correction using spherical harmonics, implemented in SCALE3 ABSPACK scaling algorithm. |
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 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 | ||
C1 | −0.01166 (16) | 0.27278 (16) | 0.42995 (11) | 0.0350 (5) | |
C2 | −0.08805 (18) | 0.29514 (18) | 0.48387 (12) | 0.0388 (5) | |
C3 | −0.1383 (2) | 0.3902 (2) | 0.48790 (14) | 0.0527 (6) | |
H3 | −0.1875 | 0.4044 | 0.5253 | 0.063* | |
C4 | −0.1152 (2) | 0.4641 (2) | 0.43633 (15) | 0.0570 (7) | |
H4 | −0.1501 | 0.5283 | 0.4381 | 0.068* | |
C5 | −0.0406 (2) | 0.4437 (2) | 0.38192 (15) | 0.0555 (7) | |
H5 | −0.0253 | 0.4942 | 0.3470 | 0.067* | |
C6 | 0.0114 (2) | 0.34880 (18) | 0.37891 (13) | 0.0458 (6) | |
H6 | 0.0624 | 0.3358 | 0.3423 | 0.055* | |
C7 | −0.04990 (18) | 0.07627 (17) | 0.31441 (11) | 0.0374 (5) | |
C8 | −0.12208 (17) | −0.00987 (17) | 0.29044 (11) | 0.0360 (5) | |
C9 | −0.12101 (18) | −0.10611 (17) | 0.32424 (11) | 0.0382 (5) | |
H9 | −0.0711 | −0.1183 | 0.3616 | 0.046* | |
C10 | −0.19217 (19) | −0.18475 (18) | 0.30397 (12) | 0.0410 (5) | |
C11 | −0.2658 (2) | −0.16427 (19) | 0.24824 (13) | 0.0478 (6) | |
H11 | −0.3160 | −0.2150 | 0.2345 | 0.057* | |
C12 | −0.2657 (2) | −0.0692 (2) | 0.21280 (13) | 0.0508 (6) | |
H12 | −0.3144 | −0.0575 | 0.1747 | 0.061* | |
C13 | −0.19427 (19) | 0.00806 (19) | 0.23328 (12) | 0.0439 (5) | |
H13 | −0.1943 | 0.0717 | 0.2091 | 0.053* | |
C14 | −0.1881 (2) | −0.2872 (2) | 0.34183 (15) | 0.0585 (7) | |
H14A | −0.1384 | −0.2832 | 0.3823 | 0.070* | |
H14B | −0.1636 | −0.3397 | 0.3083 | 0.070* | |
H14C | −0.2598 | −0.3048 | 0.3593 | 0.070* | |
N1 | −0.01587 (16) | 0.06904 (15) | 0.38733 (10) | 0.0396 (4) | |
H1N | −0.0492 (18) | 0.0295 (18) | 0.4169 (12) | 0.048* | |
N2 | −0.11943 (17) | 0.21727 (18) | 0.53943 (12) | 0.0520 (5) | |
O1 | 0.15719 (13) | 0.17155 (13) | 0.38424 (9) | 0.0509 (4) | |
O2 | 0.07425 (14) | 0.11701 (13) | 0.50054 (9) | 0.0467 (4) | |
O3 | −0.02247 (15) | 0.14867 (13) | 0.27686 (9) | 0.0522 (4) | |
O4 | −0.1626 (2) | 0.13838 (17) | 0.51818 (12) | 0.0779 (6) | |
O5 | −0.10064 (18) | 0.23912 (19) | 0.60303 (10) | 0.0743 (6) | |
S1 | 0.06292 (4) | 0.15463 (4) | 0.42754 (3) | 0.03641 (18) |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.0315 (10) | 0.0356 (11) | 0.0379 (10) | −0.0050 (9) | −0.0016 (8) | 0.0003 (9) |
C2 | 0.0348 (11) | 0.0432 (12) | 0.0383 (11) | −0.0042 (10) | 0.0017 (9) | 0.0074 (10) |
C3 | 0.0457 (14) | 0.0565 (15) | 0.0558 (14) | 0.0051 (12) | 0.0116 (11) | 0.0021 (12) |
C4 | 0.0618 (17) | 0.0420 (14) | 0.0672 (16) | 0.0094 (13) | 0.0066 (13) | 0.0048 (12) |
C5 | 0.0707 (17) | 0.0399 (13) | 0.0559 (14) | −0.0009 (13) | 0.0121 (13) | 0.0125 (12) |
C6 | 0.0521 (14) | 0.0427 (13) | 0.0427 (12) | −0.0032 (11) | 0.0105 (10) | 0.0024 (10) |
C7 | 0.0424 (12) | 0.0369 (11) | 0.0328 (10) | 0.0049 (10) | −0.0020 (9) | −0.0024 (9) |
C8 | 0.0386 (11) | 0.0380 (11) | 0.0315 (10) | 0.0037 (10) | −0.0018 (8) | −0.0051 (9) |
C9 | 0.0399 (12) | 0.0415 (12) | 0.0331 (10) | 0.0026 (10) | −0.0059 (9) | −0.0043 (9) |
C10 | 0.0441 (12) | 0.0414 (12) | 0.0374 (11) | −0.0008 (10) | 0.0012 (9) | −0.0078 (10) |
C11 | 0.0454 (13) | 0.0486 (13) | 0.0492 (13) | −0.0030 (11) | −0.0073 (10) | −0.0171 (11) |
C12 | 0.0526 (15) | 0.0542 (15) | 0.0457 (12) | 0.0088 (12) | −0.0184 (11) | −0.0125 (12) |
C13 | 0.0545 (14) | 0.0402 (12) | 0.0371 (11) | 0.0100 (11) | −0.0077 (10) | −0.0051 (10) |
C14 | 0.0701 (17) | 0.0478 (14) | 0.0577 (15) | −0.0141 (13) | −0.0055 (13) | −0.0004 (13) |
N1 | 0.0475 (11) | 0.0375 (10) | 0.0337 (9) | −0.0093 (9) | −0.0039 (8) | 0.0002 (8) |
N2 | 0.0445 (12) | 0.0611 (14) | 0.0505 (12) | 0.0044 (11) | 0.0119 (9) | 0.0157 (11) |
O1 | 0.0370 (9) | 0.0558 (10) | 0.0600 (10) | −0.0012 (8) | 0.0064 (8) | −0.0048 (8) |
O2 | 0.0538 (10) | 0.0472 (9) | 0.0392 (8) | 0.0012 (8) | −0.0141 (7) | 0.0009 (7) |
O3 | 0.0684 (11) | 0.0454 (9) | 0.0428 (9) | −0.0089 (9) | −0.0063 (8) | 0.0099 (8) |
O4 | 0.0936 (16) | 0.0595 (13) | 0.0806 (14) | −0.0224 (12) | 0.0100 (12) | 0.0177 (11) |
O5 | 0.0813 (14) | 0.0986 (17) | 0.0429 (10) | 0.0126 (13) | 0.0139 (10) | 0.0159 (11) |
S1 | 0.0352 (3) | 0.0378 (3) | 0.0362 (3) | −0.0018 (2) | −0.0033 (2) | −0.0015 (2) |
C1—C6 | 1.381 (3) | C9—H9 | 0.9300 |
C1—C2 | 1.389 (3) | C10—C11 | 1.386 (3) |
C1—S1 | 1.772 (2) | C10—C14 | 1.489 (4) |
C2—C3 | 1.369 (3) | C11—C12 | 1.384 (4) |
C2—N2 | 1.478 (3) | C11—H11 | 0.9300 |
C3—C4 | 1.369 (4) | C12—C13 | 1.374 (3) |
C3—H3 | 0.9300 | C12—H12 | 0.9300 |
C4—C5 | 1.376 (4) | C13—H13 | 0.9300 |
C4—H4 | 0.9300 | C14—H14A | 0.9600 |
C5—C6 | 1.376 (3) | C14—H14B | 0.9600 |
C5—H5 | 0.9300 | C14—H14C | 0.9600 |
C6—H6 | 0.9300 | N1—S1 | 1.6374 (19) |
C7—O3 | 1.205 (3) | N1—H1N | 0.847 (16) |
C7—N1 | 1.402 (3) | N2—O4 | 1.208 (3) |
C7—C8 | 1.482 (3) | N2—O5 | 1.220 (3) |
C8—C9 | 1.383 (3) | O1—S1 | 1.4159 (17) |
C8—C13 | 1.389 (3) | O2—S1 | 1.4288 (16) |
C9—C10 | 1.384 (3) | ||
C6—C1—C2 | 118.2 (2) | C11—C10—C14 | 122.2 (2) |
C6—C1—S1 | 118.96 (17) | C12—C11—C10 | 120.8 (2) |
C2—C1—S1 | 122.75 (16) | C12—C11—H11 | 119.6 |
C3—C2—C1 | 121.6 (2) | C10—C11—H11 | 119.6 |
C3—C2—N2 | 116.8 (2) | C13—C12—C11 | 120.7 (2) |
C1—C2—N2 | 121.6 (2) | C13—C12—H12 | 119.6 |
C4—C3—C2 | 119.3 (2) | C11—C12—H12 | 119.6 |
C4—C3—H3 | 120.3 | C12—C13—C8 | 119.3 (2) |
C2—C3—H3 | 120.3 | C12—C13—H13 | 120.3 |
C3—C4—C5 | 120.3 (2) | C8—C13—H13 | 120.3 |
C3—C4—H4 | 119.9 | C10—C14—H14A | 109.5 |
C5—C4—H4 | 119.9 | C10—C14—H14B | 109.5 |
C4—C5—C6 | 120.3 (2) | H14A—C14—H14B | 109.5 |
C4—C5—H5 | 119.9 | C10—C14—H14C | 109.5 |
C6—C5—H5 | 119.9 | H14A—C14—H14C | 109.5 |
C5—C6—C1 | 120.3 (2) | H14B—C14—H14C | 109.5 |
C5—C6—H6 | 119.8 | C7—N1—S1 | 123.95 (16) |
C1—C6—H6 | 119.8 | C7—N1—H1N | 120.4 (17) |
O3—C7—N1 | 120.8 (2) | S1—N1—H1N | 113.5 (17) |
O3—C7—C8 | 125.01 (19) | O4—N2—O5 | 125.7 (2) |
N1—C7—C8 | 114.15 (19) | O4—N2—C2 | 117.4 (2) |
C9—C8—C13 | 119.5 (2) | O5—N2—C2 | 116.9 (2) |
C9—C8—C7 | 121.99 (18) | O1—S1—O2 | 119.82 (11) |
C13—C8—C7 | 118.5 (2) | O1—S1—N1 | 109.29 (10) |
C8—C9—C10 | 121.8 (2) | O2—S1—N1 | 104.51 (10) |
C8—C9—H9 | 119.1 | O1—S1—C1 | 107.53 (10) |
C10—C9—H9 | 119.1 | O2—S1—C1 | 108.46 (10) |
C9—C10—C11 | 117.8 (2) | N1—S1—C1 | 106.52 (10) |
C9—C10—C14 | 120.0 (2) | ||
C6—C1—C2—C3 | −1.2 (3) | C14—C10—C11—C12 | −178.3 (2) |
S1—C1—C2—C3 | 174.72 (19) | C10—C11—C12—C13 | −1.7 (4) |
C6—C1—C2—N2 | 178.5 (2) | C11—C12—C13—C8 | −0.3 (4) |
S1—C1—C2—N2 | −5.6 (3) | C9—C8—C13—C12 | 2.0 (3) |
C1—C2—C3—C4 | 2.0 (4) | C7—C8—C13—C12 | −176.7 (2) |
N2—C2—C3—C4 | −177.7 (2) | O3—C7—N1—S1 | −0.6 (3) |
C2—C3—C4—C5 | −1.4 (4) | C8—C7—N1—S1 | −179.30 (15) |
C3—C4—C5—C6 | 0.0 (4) | C3—C2—N2—O4 | 117.3 (3) |
C4—C5—C6—C1 | 0.7 (4) | C1—C2—N2—O4 | −62.4 (3) |
C2—C1—C6—C5 | −0.1 (3) | C3—C2—N2—O5 | −61.8 (3) |
S1—C1—C6—C5 | −176.2 (2) | C1—C2—N2—O5 | 118.5 (3) |
O3—C7—C8—C9 | 157.0 (2) | C7—N1—S1—O1 | −51.6 (2) |
N1—C7—C8—C9 | −24.3 (3) | C7—N1—S1—O2 | 179.02 (18) |
O3—C7—C8—C13 | −24.3 (3) | C7—N1—S1—C1 | 64.3 (2) |
N1—C7—C8—C13 | 154.3 (2) | C6—C1—S1—O1 | 16.5 (2) |
C13—C8—C9—C10 | −1.7 (3) | C2—C1—S1—O1 | −159.39 (18) |
C7—C8—C9—C10 | 176.87 (19) | C6—C1—S1—O2 | 147.47 (18) |
C8—C9—C10—C11 | −0.2 (3) | C2—C1—S1—O2 | −28.4 (2) |
C8—C9—C10—C14 | 180.0 (2) | C6—C1—S1—N1 | −100.53 (19) |
C9—C10—C11—C12 | 1.9 (3) | C2—C1—S1—N1 | 83.54 (19) |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1N···O2i | 0.85 (2) | 2.43 (2) | 3.232 (3) | 157 (2) |
Symmetry code: (i) −x, −y, −z+1. |
Experimental details
Crystal data | |
Chemical formula | C14H12N2O5S |
Mr | 320.32 |
Crystal system, space group | Orthorhombic, Pbca |
Temperature (K) | 293 |
a, b, c (Å) | 12.227 (1), 12.854 (1), 18.317 (2) |
V (Å3) | 2878.8 (5) |
Z | 8 |
Radiation type | Mo Kα |
µ (mm−1) | 0.25 |
Crystal size (mm) | 0.48 × 0.44 × 0.32 |
Data collection | |
Diffractometer | Oxford Diffraction Xcalibur diffractometer with a Sapphire CCD detector |
Absorption correction | Multi-scan (CrysAlis RED; Oxford Diffraction, 2009) |
Tmin, Tmax | 0.889, 0.924 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 7423, 2936, 2306 |
Rint | 0.019 |
(sin θ/λ)max (Å−1) | 0.625 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.044, 0.124, 1.04 |
No. of reflections | 2936 |
No. of parameters | 203 |
No. of restraints | 1 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.38, −0.33 |
Computer programs: CrysAlis CCD (Oxford Diffraction, 2009), CrysAlis RED (Oxford Diffraction, 2009), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), PLATON (Spek, 2009).
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1N···O2i | 0.847 (16) | 2.434 (19) | 3.232 (3) | 157 (2) |
Symmetry code: (i) −x, −y, −z+1. |
Acknowledgements
BTG thanks the University Grants Commission, Government of India, New Delhi, for a special grant under the UGC–BSR one-time grant to faculty.
References
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Usha, K. M. & Gowda, B. T. (2006). J. Chem. Sci. 118, 351–359. Web of Science CrossRef CAS Google Scholar
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Diaryl acylsulfonamides are known as potent antitumor agents. As part of our studies on the substituent effects on the structures and other aspects of N-(aryl)-amides (Bowes et al., 2003; Gowda et al., 1999, 2003), N-(aryl)-methanesulfonamides (Gowda et al., 2007), N-(aryl)-arylsulfonamides (Shetty & Gowda, 2005); N-(substitutedbenzoyl)-arylsulfonamides (Suchetan et al., 2012); N-chloroarylsulfonamides (Jyothi & Gowda, 2004) and N-bromoarylsulfonamides (Usha & Gowda, 2006), in the present work, the crystal structure of N-(3-methylbenzoyl)-2-nitrobenzenesulfonamide (I) has been determined (Fig.1).
The conformation between the N—H and C=O bonds in the C—SO2—NH—C(O) segment is anti and the N—C bond in the segment has gauche torsion with respect to the S═O bonds (Fig.1), similar to that observed in N-(2-chlorobenzoyl)- 2-nitrobenzenesulfonamide (II)(Suchetan et al., 2012). In (I), the conformation between the N—H bond and the ortho-nitro group in the sulfonyl benzene ring is syn, similar to that observed in (II). Further, the conformation of the C═O is anti to the meta-methyl group in the benzoyl ring, similar to that observed between the C═O and the ortho-Cl atom in (II).
The molecule is twisted at the S—N bond with the torsional angle of 64.32 (20)°, compared to the value of -59.68 (17)° in (II).
The dihedral angle between the sulfonyl benzene ring and the —SO2—NH—C—O segment is 75.7 (1)°, compared to the value of 77.5 (1)° in (II). Furthermore, the dihedral angle between the sulfonyl and the benzoyl benzene rings is 89.5 (1)°, compared to the value of 71.2 (1)° in (II).
In the crystal, the intermolecular N–H···O (S) hydrogen bonds (Table 1) link the molecules into dimeric chains. Part of the crystal structure is shown in Fig. 2.