The molecule is a member of the class of azobenzenes that is azobenzene in which the para position of one of the phenyl groups is substituted by a carboxy group, whilst that of the other phenyl group is substituted by a sulfo group. It is a sulfobenzoic acid, a monocarboxylic acid and a member of azobenzenes. It is a conjugate acid of a 4-carboxylato-4'-sulfonatoazobenzene.
4-[(4-sulfophenyl)diazenyl]benzoic acid