2,3,6-Naphthalenetrisulfonic acid, 8,8'-(carbonylbis(imino(5-methoxy-2-methyl-4,1-phenylene)azo))bis-, hexasodium salt 75268-69-8 EINECS 278-158-7 Hexasodium 8,8'-(carbonylbis(imino(5-methoxy-2-methyl-4,1-phenylene)azo))bisnaphthalene-2,3,6-trisulphonate