In the title compound, C(14)H(13)NO(4)S·C(3)H(7)NO, the C-S-N-C torsion angle of -64.55 (17)° defines the folded conformation of the mol-ecule. The dihedral angle between the benzene rings is 83.367 (6)°. In a crystal, mol-ecules are linked into a chain along a axis through inter-molecular N-H⋯O and O-H⋯O hydrogen bonds. There is also an intra-molecular C-H⋯π inter-action.