68555-96-4 97393-31-2 Cuprate(2-), (7-amino-4-hydroxy-3-((2-hydroxy-5-sulfophenyl)azo)-2-naphthalenesulfonato(4-))-, dihydrogen Dihydrogen (7-amino-4-hydroxy-3-((2-hydroxy-5-sulphophenyl)azo)naphthalene-2-sulphonato(4-))cuprate(2-) EINECS 271-465-7