68400-21-5 Cuprate(2-), (6-((7-((ethenylsulfonyl)methylamino)-1-(hydroxy-kappaO)-3-sulfo-2-naphthalenyl)azo-kappaN)-5-(hydroxy-kappaO)-1-naphthalenesulfonato(4-))-, dihydrogen Dihydrogen (6-((1-hydroxy-7-(methyl(vinylsulphonyl)amino)-3-sulpho-2-naphthyl)azo)-5-hydroxynaphthalene-1-sulphonato(4-))cuprate(2-) EINECS 270-012-0