Synonyms: Cuprate(3-), .mu.-4-3,3-di(hydroxy-.kappa.O)-4-1-(hydroxy-.kappa.O)-6-(phenylamino)-3-sulfo-2-naphthalenylazo-.kappa.N11,1-biphenyl-4-ylazo-.kappa.N1-3-(hydroxy-.kappa.O)-2,7-naphthalenedisulfonato(7-)di-, trisodium;Cuprate, [μ-[4-[[3,3'-dihydroxy-4'-[[1-hydroxy-6-(phenylamino)-3-sulfo-2-naphthalenyl]azo][1,1'-biphenyl]-4-yl]azo]-3-hydroxy-2,7-naphthalenedisulfonato]]di-, trisodium;Cuprate(3-), [μ-[4-[[3,3'-dihydroxy- 4'-[[1-hydroxy-6-(phenylamino)-3-sulfo-2-naphthalenyl ]azo][1,1'-biphenyl]-4-yl]azo]-3-hydroxy-2,7-naphthalenedisulfonat o(7-)]]di-, trisodium