In the title salt, C(16)H(36)N(+)·C(14)H(8)N(3)O(3)S(-), the torsion angles within the cation reveal that one butyl group displays an anti conformation and the other three butyl groups show gauche conformations. The anion is almost planar, with a largest deviation of 0.166 (6) Å from the least-squares plane (r.m.s. deviation of fitted atoms = 0.052 Å). In the crystal structure, the component ions inter-act by means of weak inter-molecular C-H⋯O hydrogen bonds.
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