Synonyms: Cuprate(4-),[m-[[3,3'-[(3,3'-dihydroxy[1,1'-biphenyl]-4,4'-diyl)bis(azo)]bis[5-amino-4-hydroxy-2,7-naphthalenedisulfonato]](8-)]]tetrakis[2,2'-iminobis[ethanol]-N]di-,tetrahydrogen; Cuprate(4-), [m-[[3,3'-[[3,3'-di(hydroxy-kO)[1,1'-biphenyl]-4,4'-diyl]bis(azo-kN1)]bis[5-amino-4-(hydroxy-kO)-2,7-naphthalenedisulfonato]](8-)]]tetrakis[2,2'-(imino-kN)bis[ethanol]]di-, tetrahydrogen(9CI); 2,7-Naphthalenedisulfonic acid, 3,3'-[(3,3'-dihydroxy[1,1'-biphenyl]-4,4'-diyl)bis(azo)]bis[5-amino-4-hydroxy-,copper complex; Ethanol, 2,2'-iminobis-, copper complex