2,3-Dihydro-1 lambda(6),2-benzothiazine-1,1,4-trione

In the title compound, C8H7NO3S, the benzene ring is oriented at a dihedral angle of 69.25 (7)degrees 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 center dot center dot center dot O-e (c = carbonyl) hydrogen bonds, forming C(5) chains along [001]. Two R-2(2)(10) loops arise from pairs of C-H center dot center dot center dot O hydrogen bonds and a weak aromatic pi-pi stacking interaction [centroid-centorid separation = 3.8404 (11) angstrom] also occurs.