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In the title compound, C 8 H 7 NO 3 S, the benzene ring is oriented at a dihedral angle of 69.25 (7)° to the S and O atoms of the sulfonyl group. The heterocyclic ring approximates to an envelope, with the N atom in the flap position. In the crystal, mol­ecules are linked by N—H⋯O c  (c = carbon­yl) hydrogen bonds, forming  C (5) chains along [001]. Two  R   2   2 (10) loops arise from pairs of C—H⋯O hydrogen bonds and a weak aromatic π–π stacking inter­action [centroid–centorid separation = 3.8404 (11) Å] also occurs.

2,3-Dihydro-1λ6,2-benzothiazine-1,1,4-trione

2,3-Dihydro-1λ⁶,2-benzothiazine-1,1,4-trione