73507-22-9 EINECS 277-496-2 Trisodium (mu-(3-((4'-((6-anilino-1-hydroxy-3-sulpho-2-naphthyl)azo)-3,3'-dihydroxy(1,1'-biphenyl)-4-yl)azo)-4-hydroxynaphthalene-2,7-disulphonato(7-)))dicuprate(3-)