Acta Cryst. (2008). E64, o1922  [ doi:10.1107/S1600536808028584 ]

Methyl 4-hydroxy-2H-1,2-benzothiazine-3-carboxylate 1,1-dioxide

W. A. Siddiqui, S. Ahmad, H. L. Siddiqui, M. H. Bukhari and M. Parvez

Abstract: The asymmetric unit of the title compound, C₁₀H₉NO₅S, contains two independent molecules. The heterocyclic thiazine rings in both molecules adopt half-chair conformations, with the S atoms in each molecule displaced by 0.455 (3) and 0.539 (3) Å and the N atoms displaced in the opposite direction by 0.214 (3) and 0.203 (3) Å, from the planes defined by the remaining ring atoms. The crystal structure is stabilized by O-HO, N-HO and C-HO hydrogen bonds involving both inter- and intramolecular interactions.

Online 13 September 2008

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