2-Naphthalenesulfonic acid, 6-((2,4-dihydroxy-3-((2-hydroxy-3-nitro-5-sulfophenyl)azo)phenyl)azo)-4-hydroxy-3-((4-nitrophenyl)azo)- 6-((2,4-Dihydroxy-3-((2-hydroxy-3-nitro-5-sulphophenyl)azo)phenyl)azo)-4-hydroxy-3-((4-nitrophenyl)azo)naphthalene-2-sulphonic acid 82599-59-5 EINECS 280-004-9