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There are two independent molecules in the asymmetric unit of the title compound, C 13 H 13 NO 7 S, which have almost identical geometries. The thiazine ring adopts a sofa conformation in both molecules and the molecular conformations are stabilized by intramolecular O—H⋯O hydrogen bonds. Intermolecular C—H⋯O hydrogen bonds stabilize the crystal packing.

Methyl 4-hydroxy-2-methoxycarbonylmethyl-1,1-dioxo-1,2-dihydro-1λ6,2-benzothiazine-3-carboxylate

Methyl 4-hydroxy-2-methoxycarbonylmethyl-1,1-dioxo-1,2-dihydro-1λ⁶,2-benzothiazine-3-carboxylate