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In the crystal structure of the title compound, C 9 H 7 N 2 O 2 S + ·C 7 H 5 O 6 S − ·2H 2 O, an H atom from the 5-sulfosalicylic acid is transferred to the pyridyl N atom, forming a salt. The dihedral angle between the thiazole and pyridinium rings is 5.909 (5)°. The crystal packing is determined by O—H⋯O and N—H⋯O hydrogen bonds involving water mol­ecules.

4-(4-Carboxy-1,3-thiazol-2-yl)pyridinium 3-carboxy-4-hydroxybenzenesulfonate dihydrate