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The title salt, C 8 H 20 N + ·C 22 H 27 O 3 S − , is a proton-transfer compound derived from the recently reported parent carb­oxy­lic acid [Alhadi  et al.  (2010).  Acta Cryst.  E 66 , o1787] by the addition of a second equivalent of di- n -butyl­amine, yielding the di- n -butyl­ammonium carboxyl­ate salt. The structure of the carboxyl­ate anion resembles that of the parent carb­oxy­lic acid. The main difference lies in the position of the H atom in the 4-hy­droxy group. In the anion the O—H bond is perpendicular, rather than parallel, to the benzyl ring. This position appears to facilitate hydrogen bonding to an O atom of the carboxyl­ate group of a symmetry-related anion. In addition, there are three N—H⋯O hydrogen bonds. In contrast, the neutral species hydrogen bonds  via  a carboxylic acid dimer. The dihedral angle between the benzene rings in the anion is 79.19 (7)°.

Di-n-butylammonium 2-[(3,5-di-tert-butyl-4-hydroxybenzyl)sulfanyl]benzoate