Synonyms: Cuprate(4-),[m-[4-amino-6-[[3,3'-di(hydroxy-kO)-4'-[[2-(hydroxy-kO)-3,6-disulfo-1-naphthalenyl]azo-kN1][1,1'-biphenyl]-4-yl]azo-kN1]-5-(hydroxy-kO)-1,3-naphthalenedisulfonato(8-)]]di-,tetrasodium (9CI); Cuprate(4-), [m-[4-amino-6-[[3,3'-dihydroxy-4'-[(2-hydroxy-3,6-disulfo-1-naphthalenyl)azo][1,1'-biphenyl]-4-yl]azo]-5-hydroxy-1,3-naphthalenedisulfonato(8-)]]di-,tetrasodium; 1,3-Naphthalenedisulfonic acid, 4-amino-6-[[3,3'-dihydroxy-4'-[(2-hydroxy-3,6-disulfo-1-naphthalenyl)azo][1,1'-biphenyl]-4-yl]azo]-5-hydroxy-,copper complex