Cuprate(4-), (mu-(3-((3,3'-dihydroxy-4'-((2-hydroxy-3,6-disulfo-1-naphthalenyl)azo)(1,1'-biphenyl)-4-yl)azo)-4-hydroxy-2,7-naphthalenedisulfonato(8-)))di-, tetrasodium;Cuprate(4-), (mu-(3-((3,3'-di(hydroxy-kappaO)-4'-((2-(hydroxy-kappaO)-3,6-disulfo-1-naphthalenyl)azo-kappaN1)(1,1'-biphenyl)-4-yl)azo-kappaN1)-4-(hydroxy-kappaO)-2,7-naphthalenedisulfonato(8-)))di-, tetrasodium;Cuprate(4-), (mu-(3-(2-(3,3'-di(hydroxy-kappaO)-4'-(2-(2-(hydroxy-kappaO)-3,6-disulfo-1-naphthalenyl)diazenyl-kappaN1)(1,1'-biphenyl)-4-yl)diazenyl-kappaN1)-4-(hydroxy-kappaO)-2,7-naphthalenedisulfonato(8-)))di-, sodium (1:4);Tetrasodium (mu-(3-((3,3'-dihydroxy-4'-((2-hydroxy-3,6-disulpho-1-naphthyl)azo)(1,1'-biphenyl)-4-yl)azo)-4-hydroxynaphthalene-2,7-disulphonato(8-)))dicuprate(4-);copper(2+) sodium 4-[(E)-{3,3'-dioxido-4'-[(E)-(1-oxido-3,6-disulfonatonaphthalen-2-yl)diazenyl]biphenyl-4-yl}diazenyl]-3-oxidonaphthalene-2,7-disulfonate (2:4:1)