Received 1 December 2011
aInstitute of Chemistry, University of the Punjab, Lahore 54590, Pakistan,bDepartment of Chemistry, Government College University, Faisalabad 3800, Pakistan, and cDepartment of Chemistry, The University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4
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In the title molecule, C23H17NO5S, the heterocyclic thiazine ring adopts a half-chair conformation, with the S and N atoms displaced by 0.383 (3) and 0.473 (3) Å, respectively, on opposite sides of the mean plane formed by the ring C atoms. The phenyl rings attached to carbonyl groups lie almost parallel to each other at a dihedral angle 7.43 (9)°, the distance between the centroids of the rings being 3.780 (1) Å. The C(thiazine)-C=O and O=C-CH2 groups make dihedral angles of 37.56 (16) and 1.93 (18)°, respectively, with the phenyl groups to which they are attached. The crystal structure features O-HO and C-HO hydrogen bonds and further consolidated by C-H interactions; an intramolecular O-HO hydrogen bond is also present.
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: 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: WN2461 ).
HLS is grateful to the Institute of Chemistry, University of the Punjab, Lahore, Pakistan, for financial support.
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