| Summary: | In the title compound, C25H21NO7S, the heterocyclic thiazine ring adopts a half-chair conformation, with the S and N atoms displaced by −0.284 (3) and 0.411 (3) Å, respectively, from the plane formed by the remaining ring atoms; the puckering parameters are: Q = 0.4576 (13) Å, θ = 58.6 (2) and ϕ = 34.3 (3)°. The structure is devoid of any classical hydrogen bonds. However, intramolecular C—H...N and O—H...O hydrogen bonds result in six-membered rings and intermolecular C—H...O interactions stabilize the crystal structure.
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