Received 1 December 2011
There are two independent molecules in the asymmetric unit of the title compound, C23H17N2O4S, with significant differences in their conformations, e.g. the benzene rings of the benzothiazine and benzonitrile units are inclined at 28.19 (10) and 17.89 (7)° in the two molecules, with the centroids of the rings separated by 3.975 (2) and 3.637 (2) Å, respectively. Moreover, the N-C-C-C torsion angles involving the benzoyl group are 14.3 (5) and 8.2 (5)° in the two molecules, showing different degrees of rotation of this group. In both molecules, the heterocyclic thiazine rings adopt half-chair conformations, with the S and N atoms displaced by 0.427 (6) and 0.365 (6) Å, respectively, in one molecule and by 0.356 (6) and 0.432 (6) Å, respectively, in the other, on opposite sides of the mean planes formed by the remaining ring atoms. The crystal structure is stabilized by intermolecular C-HO hydrogen bonds and further consolidated by intramolecular O-HO hydrogen bonds.
Data collection: COLLECT (Hooft, 1998); cell refinement: DENZO (Otwinowski & Minor, 1997); data reduction: SCALEPACK (Otwinowski & Minor, 1997); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: Mercury (Macrae et al., 2008) and ORTEP-3 for Windows (Farrugia, 1997); software used to prepare material for publication: SHELXL97.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: ZL2435 ).
HLS is grateful to the Institute of Chemistry, University of the Punjab, Lahore, Pakistan, for financial support.
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