disodium 4-hydroxy-7-[[[[5-hydroxy-6-[(2-methoxyphenyl)azo]-7-sulphonato-2-naphthyl]amino]carbonyl]amino]-3-[(o-tolyl)azo]naphthalene-2-sulphonate

4-Hydroxy-7-[[[[5-hydroxy-6-[(2-methoxyphenyl)azo]-7-sodiosulfo-2-naphtyl]amino]carbonyl]amino]-3-[(2-methylphenyl)azo]-2-naphthalenesulfonic acid sodium salt