Synonyms: Cuprate(2-),[3-[[2,4-dihydroxy-5-[(4-nitrophenyl)azo]-3-[[4-[(4-nitro-2-sulfophenyl)amino]phenyl]azo]phenyl]azo]-4-hydroxy-5-nitrobenzenesulfonato(4-)]-,disodium; Cuprate(2-), [3-[[2-(hydroxy-kO)-4-hydroxy-5-[(4-nitrophenyl)azo]-3-[[4-[(4-nitro-2-sulfophenyl)amino]phenyl]azo]phenyl]azo-kN1]-4-(hydroxy-kO)-5-nitrobenzenesulfonato(4-)]-,disodium (9CI); Benzenesulfonic acid,3-[[2,4-dihydroxy-5-[(4-nitrophenyl)azo]-3-[[4-[(4-nitro-2-sulfophenyl)amino]phenyl]azo]phenyl]azo]-4-hydroxy-5-nitro-,copper complex