2-Naphthalenesulfonic acid, 7-amino-4-hydroxy-3-((4-((4-sulfophenyl)azo)phenyl)azo)-, diammonium salt 68227-38-3 7-Amino-4-hydroxy-3-(4-(4-(sulfophenyl)azo)phenylazo)-2-naphthalenesulfonic acid, diammonium salt Diammonium 7-amino-4-hydroxy-3-((4-((4-sulphonatophenyl)azo)phenyl)azo)naphthalene-2-sulphonate EINECS 269-350-1