(5Or8)-((2,4-diamino-5-((4-sulphophenyl)azo)phenyl)azo)-(8or5)-(phenylazo)naphthalene-2-sulphonic acid 2-Naphthalenesulfonic acid, 5(or 8)-((2,4-diamino-5-((4-sulfophenyl)azo)phenyl)azo)-8(or 5)-(phenylazo)- 6(7)-Sulfo-4-((2,4-diamino-5-((4-sulfophenyl)azo)phenyl)azo)-1-naphthaleneazobenzene 70660-63-8 EINECS 274-737-3