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In the title compound, 2C3H5N2S+·C4H4O42−·C4H6O4, the thiazolium ring is almost planar, with the maximum deviation from planarity being 0.0056 (8) Å for the C atom carrying the amine substituent. The N atom of the 2-aminothiazole molecule is protonated. Both the anion and the acid lie across inversion centres. The crystal packing is consolidated by intermolecular O—H...O, N—H...O and C—H...O hydrogen bonds. Molecules are stacked down the b axis.