The molecule is an organosulfonate oxoanion obtained by deprotonation of the sulfo groups of benzo scarlet 4BNS free acid. It is a conjugate base of a benzo scarlet 4BNS free acid.
4-hydroxy-7-[[5-hydroxy-7-sulfonato-6-[(6-sulfonatonaphthalen-2-yl)diazenyl]naphthalen-2-yl]carbamoylamino]-3-[(3-methoxyphenyl)diazenyl]naphthalene-2-sulfonate