2,7-Naphthalenedisulfonic acid, 4-amino-6-((2-chloro-4-nitrophenyl)azo)-5-hydroxy-3-((2-hydroxy-4-((3-hydroxy-4-((4-((4-nitro-2-sulfophenyl)amino)phenyl)azo)phenyl)amino)phenyl)azo)- 4-Amino-6-((2-chloro-4-nitrophenyl)azo)-5-hydroxy-3-((2-hydroxy-4-((3-hydroxy-4-((4-((4-nitro-2-sulphophenyl)amino)phenyl)azo)phenyl)amino)phenyl)azo)naphthalene-2,7-disulphonic acid 68134-20-3 EINECS 268-733-0