68140-34-1 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 EINECS 268-791-7 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-)