85631-89-6 EINECS 288-039-1 Trisodium 3-((2-chloro-4-nitrophenyl)azo)-4-hydroxy-5-((2-hydroxy-4-((3-hydroxy-4-((4-((4-nitro-2-sulphonatophenyl)amino)phenyl)azo)phenyl)amino)phenyl)azo)naphthalene-2,7-disulphonate