In the heteromolecular title structure, C(10)H(8)N(2)S·C(8)H(6)O(4), the two components are linked by O-H⋯N hydrogen bonds to form a one-dimensional chain. These chains are further inter-connected by weak inter-molecular C-H⋯O hydrogen bonds and weak C-H⋯π inter-actions to generate a three-dimensional supra-molecular structure.