Cuprate(2-), [4-[[4-amino-2-hydroxy-3- [(4-nitrophenyl)azo]-5Cuprate(2-), [4-[[4-amino-2-hydroxy-3- [(4-nitrophenyl)azo]-5-[[4-[(4-nitro-2-sulfophenyl )amino]phenyl]azo]phenyl]azo]-3--[[4-[(4-nitro-2-sulfopheny l)amino]phenyl]azo]phenyl]azo]-3-hydro xy-7-