| Summary: | In the crystal structure of the title compound, C7H5NO4·C9H9N3O2S2, the sulfathiazole and 4-nitrobenzoic acid molecules are held together by short π–π contacts between the thiazole and nitrobenzene rings, with a centroid–centroid distance of 3.8226 (7) Å. The sulfathiazole molecules form dimers via N—H...N hydrogen bonds involving the thiazole 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 molecules 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(sulfathiazole benzene ring) interactions.
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