2-Naphthalenesulfonic acid, 7-amino-4-hydroxy-3-((2-sulfophenyl)azo)- 22136-09-0 7-Amino-4-hydroxy-3-((2-sulfophenyl)azo)-2-naphthalenesulfonic acid 7-Amino-4-hydroxy-3-((2-sulphophenyl)azo)naphthalene-2-sulphonic acid EINECS 244-802-0