Abstract
The title compound, C15H12N2O4S, is V-shaped with the isoindoline ring system (r.m.s. deviation = 0.006 angstrom) inclined to the benzene ring by 84.27 (13). In the crystal, inversion dimers are formed via pairwise N-H center dot center dot center dot O hydrogen bonds. These dimers associate further into corrugated ribbons, via pairwise N-H center dot center dot center dot O and C-H center dot center dot center dot O hydrogen bonds, propagating along the a -axis direction and lying parallel to (001).