In the title compound, C15H18N3+*C7H7O3S-, the phenylene and pyridyl rings are somewhat twisted with respect to each other, forming a dihedral angle of 23.49 (6) degrees. The compound contains a dipolar chromophoric cation, but crystallizes in the centrosymmetric space group P2(1)/n and is thus not expected to display quadratic non-linear optical effects.