66225-64-7 Cuprate(4-), (mu-((2,2'-(1,2-ethenediylbis((3-sulfo-4,1-phenylene)-ONN-azoxy(1-(hydroxy-kappaO)-3-sulfo-7,2-naphthalenediyl)azo-kappaN1))bis(benzoato-kappaO))(8-)))di-, tetrasodium Cuprate(4-), (mu-((2,2'-(1,2-ethenediylbis((3-sulfo-4,1-phenylene)-ONN-azoxy(1-hydroxy-3-sulfo-7,2-naphthalenediyl)azo))bis(benzoate))(8-)))di-,tetrasodium