Cuprate(4-), (mu-(4-amino-6-((4'-((1-(hydroxy-kappaO)-8-hydroxy-3,6-disulfo-2-naphthalenyl)azo-kappaN1)-3,3'-di(hydroxy-kappaO)(1,1'-biphenyl)-4-yl)azo-kappaN1)-5-(hydroxy-kappaO)-1,3-naphthalenedisulfonato(8-)))di-, tetrasodium;Cuprate(4-), (mu-(4-amino-6-(2-(4'-(2-(1-(hydroxy-kappaO)-8-hydroxy-3,6-disulfo-2-naphthalenyl)diazenyl-kappaN1)-3,3'-di(hydroxy-kappaO)(1,1'-biphenyl)-4-yl)diazenyl-kappaN1)-5-(hydroxy-kappaO)-1,3-naphthalenedisulfonato(8-)))di-, sodium (1:4);Tetrasodium (mu-(4-amino-6-((4'-((1,8-dihydroxy-3,6-disulpho-2-naphthyl)azo)-3,3'-dihydroxy(1,1'-biphenyl)-4-yl)azo)-5-hydroxynaphthalene-1,3-disulphonato(8-)))dicuprate(4-);copper(2+) sodium 4-amino-6-[(E)-{3,3'-dioxido-4'-[(2E)-2-(8-oxido-1-oxo-3,6-disulfonatonaphthalen-2(1H)-ylidene)hydrazinyl]biphenyl-4-yl}diazenyl]-5-oxidonaphthalene-1,3-disulfonate (2:4:1)