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In the title salt, C8H9N2+·C7H7O3S−·H2O, the dihedral angle between the cation and anion benzene rings is 50.1 (4)°. In the cation, the cyanomethyl group is twisted from the plane of the benzene ring [C—C—C—N = −86 (12)°]. In the crystal, the cations, anions and water molecules are linked by N—H...O and O—H...O hydrogen bonds, forming a chain along the c axis.