Synonyms: Cuprate(3-), (mu-(4-((3,3'-dihydroxy-4'-((2-hydroxy-6-sulfo-1-naphthalenyl)azo)(1,1'-biphenyl)-4-yl)azo)-3-hydroxy-2,7-naphthalenedisulfonato(7-)))di-, trihydrogen;Cuprate(3-), (mu-(4-(2-(3,3'-dihydroxy-4'-(2-(2-hydroxy-6-sulfo-1-naphthalenyl)diazenyl)(1,1'-biphenyl)-4-yl)diazenyl)-3-hydroxy-2,7-naphthalenedisulfonato(7-)))di-, hydrogen (1:3);Trihydrogen (mu-(4-((3,3'-dihydroxy-4'-((2-hydroxy-6-sulpho-1-naphthyl)azo)(1,1'-biphenyl)-4-yl)azo)-3-hydroxynaphthalene-2,7-disulphonato(7-)))dicuprate(3-);copper(2+) hydrogen 4-[(E)-{3,3'-dioxido-4'-[(E)-(2-oxido-6-sulfonatonaphthalen-1-yl)diazenyl]biphenyl-4-yl}diazenyl]-3-oxidonaphthalene-2,7-disulfonate (2:3:1)