2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-3-((4-(5-((4-hydroxyphenyl)azo)-1H-benzimidazol-2-yl)phenyl)azo)-6-(phenylazo)-, disodium salt 93803-37-3 Disodium 4-amino-5-hydroxy-3-((4-(5-((4-hydroxyphenyl)azo)-1H-benzimidazol-2-yl)phenyl)azo)-6-(phenylazo)naphthalene-2,7-disulphonate EINECS 298-308-5