Experimental

R factor = 0.046; wR factor = 0.119; data-to-parameter ratio = 15.0. In the title compound, C13H12N2O4S, the dihedral angle between the planes of the rings is 51.11 (10). In the crystal, molecules are linked into inversion dimers through pairs of N—H O(S) hydrogen bonds. Related literature For studies on the effects of substituents on the structures and other aspects of N-(aryl)-amides, see: Alkan et al. (2011)