The mol-ecule of the title compound, C(16)H(17)N(3)O(5)S, crystallizes in a zwitterionic form, with a strong intra-molecular N-H⋯O hydrogen bond. The dihedral angle between the two benzene rings is 7.06 (9)°. In the crystal, mol-ecules are linked into chains along the c axis by inter-molecular N-H⋯O hydrogen bonds.
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