pentasodium 4-[[4-[(3,6-disulphonato-1-naphthyl)azo]-7-sulphonato-1-naphthyl]azo]-3-hydroxynaphthalene-2,7-disulphonate | pentasodium 4-[[4-[(3,6-disulphonato-1-naphthyl)azo]-7-sulphonato-1-naphthyl]azo]-3-hydroxynaphthalene-2,7-disulphonate | 13000-39-0 |