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The title compound, C 10 H 8 ClNO 5 S, which has potential analgesic activity, crystallizes in space group P 2 1 / n . The benzo-thia-zine ring system adopts an inter-mediate form between sofa and twist-boat conformations. The coplanarity of the ester substituent to the bicyclic fragment is stabilized by an O-H⋯O intra-molecular hydrogen bond. In the crystal, hydrogen bonds of type N-H⋯O(SO 2 ) link the mol-ecules into zigzag chains extending along the b -axis direction. Neighbouring chains are linked by both O-H⋯Cl and C-H⋯Cl inter-actions. A Hirshfeld surface analysis was used to compare different types of inter-molecular inter-actions, giving contributions of O⋯H/H⋯O = 42.0%, C⋯H/H⋯C = 17.3%, Cl⋯H/H⋯Cl = 14.2%, H⋯H = 11.1%.

Methyl 5-chloro-4-hydroxy-2,2-dioxo-1H-2λ6,1-benzothiazine-3-carboxylate: structure and Hirshfeld surface analysis

Methyl 5-chloro-4-hydroxy-2,2-dioxo-1H-2λ⁶,1-benzothiazine-3-carboxylate: structure and Hirshfeld surface analysis