Synonyms: Cuprate(4-), (2-(2-(4,5-dihydro-1-(4-(2-(3-(hydroxy-kappaO)-4-(2-(1-(hydroxy-kappaO)-6-(phenylamino)-3-sulfo-2-naphthalenyl)diazenyl-kappaN1)-7-sulfo-1-naphthalenyl)diazenyl)phenyl)-3-methyl-5-oxo-1H-pyrazol-4-yl)diazenyl)-5-sulfobenzoato(6-))-, sodium (1:4);Cuprate(4-), (2-((4,5-dihydro-1-(4-((3-(hydroxy-kappaO)-4-((1-(hydroxy-kappaO)-6-(phenylamino)-3-sulfo-2-naphthalenyl)azo-kappaN1)-7-sulfo-1-naphthalenyl)azo)phenyl)-3-methyl-5-oxo-1H-pyrazol-4-yl)azo)-5-sulfobenzoato(6-))-, tetrasodium;Cuprate(4-), (2-((4,5-dihydro-1-(4-((3-hydroxy-4-((1-hydroxy-6-(phenylamino)-3-sulfo-2-naphthalenyl)azo)-7-sulfo-1-naphthalenyl)azo)phenyl)-3-methyl-5-oxo-1H-pyrazol-4-yl)azo)-5-sulfobenzoato(6-))-, tetrasodium;Cuprate(4-), (2-((4,5-dihydro-1-(4-((3-hydroxy-4-((1-hydroxy-6-(phenylamino)-3-sulfo-2-naphthalenyl)azo)-7-sulfo-1-naphthalenyl)azo)phenyl)-3-methyl-5-oxo-1H-pyrazol-4-yl)azo)-5-sulfobenzoato(6-))-,tetrasodium