70304-36-8

tetrasodium [2-[2-[4-[[3-hydroxy-4-[(2-hydroxy-5-sulphophenyl)azo]phenyl]azoxy]-2-sulphophenyl]vinyl]-5-[[4-[(4-sulphophenyl)azo]-2,5-xylyl]azoxy]benzenesulphonato(6-)]cuprate(4-)