2-Naphthalenesulfonic acid, 6-((2,4-dihydroxy-3-((4-nitrophenyl)azo)phenyl)azo)-4-hydroxy-3-((2-hydroxy-3-nitro-5-sulfophenyl)azo)- 6-((2,4-Dihydroxy-3-((4-nitrophenyl)azo)phenyl)azo)-4-hydroxy-3-((2-hydroxy-3-nitro-5-sulphophenyl)azo)naphthalene-2-sulphonic acid 80301-65-1 EINECS 279-447-0