Synonyms: Cuprate(4-), (5-(acetylamino)-4-hydroxy-3-(2-(5-(hydroxy-kappaO)-6-(2-(2-(hydroxy-kappaO)-4-((2-(sulfooxy)ethyl)sulfonyl)phenyl)diazenyl-kappaN1)-7-sulfo-2-naphthalenyl)diazenyl)-2,7-naphthalenedisulfonato(6-))-, hydrogen (1:4);Copper, (1-hydroxy-2-((2-hydroxy-4-((2-(sulfooxy)ethyl)sulfonyl)phenyl)azo)-6-((1-hydroxy-8-acetylamino-3,6-disulfo-2-naphthalenyl)azo)-3-naphthalenesulfonato(2-))-;Cuprate(4-), (5-(acetylamino)-4-hydroxy-3-((5-(hydroxy-kappaO)-6-((2-(hydroxy-kappaO)-4-((2-(sulfooxy)ethyl)sulfonyl)phenyl)azo-kappaN1)-7-sulfo-2-naphthalenyl)azo)-2,7-naphthalenedisulfonato(6-))-, tetrahydrogen;Tetrahydrogen (5-acetamido-4-hydroxy-3-((5-hydroxy-6-((2-hydroxy-4-((2-(sulphooxy)ethyl)sulphonyl)phenyl)azo)-7-sulpho-2-naphthyl)azo)naphthalene-2,7-disulphonato(6-))cuprate(4-);copper(2+) hydrogen (3Z)-5-(acetylamino)-3-(2-{5-oxido-6-[(E)-(2-oxido-4-{[2-(sulfonatooxy)ethyl]sulfonyl}phenyl)diazenyl]-7-sulfonatonaphthalen-2-yl}hydrazinylidene)-4-oxo-3,4-dihydronaphthalene-2,7-disulfonate (1:4:1)