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

In the molecule of the title compound, C10H9NO6S·H2O, the benzothiazine ring adopts an envelope conformation. An intramolecular N—H⋯O hydrogen bond results in the formation of a nonplanar five-membered ring which has a twisted conformation. In the crystal structure, intermolecular N—H⋯O, O—H⋯O and C—H⋯O hydrogen bonds link the molecules to form a three-dimensional network. There is a π–π contact between the benzene rings [centroid–centroid distance = 3.972 (2) Å].