The molecule is an organosulfonate oxoanion obtained by deprotonation of the sulfo and carboxy groups of 5-[(3-carboxy-5-methyl-4-oxocyclohexa-2,5-dien-1-ylidene)(2-sulfophenyl)methyl]-2-hydroxy-3-methylbenzoic acid. It is an organosulfonate oxoanion and a hydroxybenzoate. It is a conjugate base of a chromoxane cyanin R free acid.
5-[(Z)-(3-carboxy-5-methyl-4-oxocyclohexa-2,5-dien-1-ylidene)-(2-sulfonatophenyl)methyl]-3-methyl-2-oxidobenzoate