In the title compound, C(15)H(16)N(2)O(6)S(2), the dihedral angle between the benzene rings is 83.2 (3)°. The mol-ecular conformation is stabilized by an intra-molecular C-H⋯O inter-action. In the crystal structure, mol-ecules are linked by N-H⋯O and C-H⋯O hydrogen bonds and additional stabilization is provided by weak C-H⋯π inter-actions.