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In the title mol­ecule, C 23 H 17 NO 5 S, the heterocyclic thia­zine ring adopts a half-chair conformation, with the S and N atoms displaced by 0.383 (3) and 0.473 (3) Å, respectively, on opposite sides of the mean plane formed by the ring C atoms. The phenyl rings attached to carbonyl groups lie almost parallel to each other at a dihedral angle 7.43 (9)°, the distance between the centroids of the rings being 3.780 (1) Å. The C(thia­zine)—C=O and O=C—CH 2  groups make dihedral angles of 37.56 (16) and 1.93 (18)°, respectively, with the phenyl groups to which they are attached. The crystal structure features O—H⋯O and C—H⋯O hydrogen bonds and further consolidated by C—H⋯π inter­actions; an intra­molecular O—H⋯O hydrogen bond is also present.

2-(3-Benzoyl-4-hydroxy-1,1-dioxo-2H-1λ6,2-benzothiazin-2-yl)-1-phenylethanone

2-(3-Benzoyl-4-hydroxy-1,1-dioxo-2H-1λ⁶,2-benzothiazin-2-yl)-1-phenylethanone