4-Nitro-benzoic acid-sulfa-thia-zole (1/1).

In the crystal structure of the title compound, C7H5NO4·C9H9N3O2S2, the sulfa-thia-zole and 4-nitro-benzoic acid mol-ecules are held together by short π-π contacts between the thia-zole and nitro-benzene rings, with a centroid-centroid distance of 3.8226 (7) Å. The sulfa-thia-zole mol-ecules form dimers via N-H⋯N hydrogen bonds involving the thia-zole and sulfonamide moieties, owing to the fact that sulfathizole exhibits amide-imide tautomerism. The N-H (amine) groups of two sulfathiazole molecules are linked to the two S=O groups of a sulfathiazole via N-H⋯O hydrogen bonds. Two mol-ecules of coformer are held together by O-H⋯O hydrogen bonds. These units self-assemble, forming a three-dimensional network stabilized by (acid)C-H⋯π(sulfa-thia-zole benzene ring) inter-actions.