In the title compound, C(15)H(14)N(4)O(3)S(2), the hydr-oxy group is disordered over two positions with occupancies of 0.619 (5) and 0.381 (5). The benzene ring attached to the heterocycle makes a dihedral angle of 86.92 (9)° with respect to the best plane through the five-membered ring. The crystal packing is stabilized by inter-molecular O-H⋯O, N-H⋯S, N-H⋯N, C-H⋯O and C-H⋯N hydrogen bonds, and N-H⋯π and C-H⋯π inter-actions.