Key indicators: single-crystal X-ray study; T = 100 K; mean (C-C) = 0.002 Å; R factor = 0.043; wR factor = 0.107; data-to-parameter ratio = 17.3.In the title compound, C 8 H 11 N 2 S + ÁC 12 H 10 NO 3 S À , the NH group of the S-benzylthiuronium is protonated and the interplanar angle between the phenyl ring and the CH 2 -S C(NH 2 ) 2 unit is 47.44 (10) . In the 4-anilinobenzenesulfonate anion, the interplanar angle between the two rings is 44.07 (8) . In the crystal structure, anions are linked into chains along the c-axis direction by N-HÁ Á ÁO hydrogen bonds, while additional N-HÁ Á ÁO interactions link the cations to the anions in chains along the b-axis direction. These chains are further interconnected into a two-dimensional network parallel to the bc plane by C-HÁ Á ÁO interactions. C-HÁ Á Á contacts are also observed.
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