2-Naphthalenesulfonic acid, 5-amino-8-((4-aminophenyl)azo)- 5-Amino-8-((p-aminophenyl)azo)-2-naphthalenesulfonic acid 5-Amino-8-((p-aminophenyl)azo)naphthalene-2-sulphonic acid 85-77-8 EINECS 201-631-6