Abstract
With respect to the aliphatic planar five-membered ring (r.m.s. deviation = 0.011 angstrom) of the title compound, C15H13N3O2S, the phenyl ring is aligned at 6.9 (1)degrees and the phenylene ring at 2.4 (1)degrees, so that the three rings are nearly coplanar. The amino group has the N atom in a pyramidal geometry; the group is a hydrogen-bond donor to the sulfonyl O atom of one molecule and to the ketonic O atom of another molecule, resulting in the formation of a layer parallel to the bc plane.