83221-78-7 4-[[1-hydroxy-6-[[[[5-hydroxy-6-[(2-methoxyphenyl)azo]-7-sulpho-2-naphthyl]amino]carbonyl]amino]-3-sulpho-2-naphthyl]azo]naphthalene-1-sulphonic acid, sodium salt
83221-77-6 4-[[1-hydroxy-6-[[[[5-hydroxy-6-(phenylazo)-7-sulpho-2-naphthyl]amino]carbonyl]amino]-3-sulpho-2-naphthyl]azo]naphthalene-1-sulphonic acid, sodium salt