2-Naphthalenesulfonic acid, 6-amino-4-hydroxy-5-((4-(((4-((4-hydroxyphenyl)azo)phenyl)amino)carbonyl)phenyl)azo)- 56670-24-7 6-Amino-4-hydroxy-5-((4-(((4-((4-hydroxyphenyl)azo)phenyl)amino)carbonyl)phenyl)azo)naphthalene-2-sulphonic acid EINECS 260-325-0