Synonyms: Cuprate(3-),[5-amino-4-(hydroxy-kO)-3-[[2-(hydroxy-kO)-5-sulfophenyl]azo-kN1]-2,7-naphthalenedisulfonato(5-)]-, trihydrogen (9CI); Cuprate(3-),[5-amino-4-hydroxy-3-[(2-hydroxy-5-sulfophenyl)azo]-2,7-naphthalenedisulfonato(5-)]-,trihydrogen; 2,7-Naphthalenedisulfonic acid,5-amino-4-hydroxy-3-[(2-hydroxy-5-sulfophenyl)azo]-, copper complex