Ethyl 3-methyl-1-oxo-4H-1,4-benzo­thia­zine-2-carboxyl­ate monohydrate

The organic molecule in the title hydrate, C12H13NO3S·H2O, is folded across the S⋯N vector. Chains two molecules thick extending along the a-axis direction are formed by N—H⋯O and O—H⋯O hydrogen bonds. These inter­actions are reinforced by C—H⋯S hydrogen bonds and offset π-stacking inter­actions between centrosymmetrically related benzene rings. The chains are associated through C—H⋯O hydrogen bonds.