34870-85-4 EINECS 252-261-7 Tetrasodium (8-hydroxy-7-((2-hydroxy-5-methyl-4-((3-((2-(sulphooxy)ethyl)sulphonyl)phenyl)azo)phenyl)azo)naphthalene-1,3,6-trisulphonato(6-))cuprate(4-)