2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-3-((4-(5-((4-hydroxyphenyl)azo)-1H-benzimidazol-2-yl)phenyl)azo)-6-(phenylazo)- 4-Amino-5-hydroxy-3-((4-(5-((4-hydroxyphenyl)azo)-1H-benzimidazol-2-yl)phenyl)azo)-6-(phenylazo)naphthalene-2,7-disulphonic acid 67846-55-3 EINECS 267-368-4