2,7-Naphthalenedisulfonic acid, 4-((2,4-dihydroxy-5-((2-hydroxy-3,5-dinitrophenyl)azo)-3-((4-nitrophenyl)azo)phenyl)azo)-5-hydroxy-, disodium salt 4-((2,4-Dihydroxy-3-((4-nitrophenyl)azo)-5-((3,5-dinitro-2-hydroxyphenyl)azo)phenyl)azo)-5-hydroxy-2,7-naphthalenedisulfonic acid, disodium salt 6637-87-2 C.I. Acid Brown 75 Disodium 4-((2,4-dihydroxy-5-((2-hydroxy-3,5-dinitrophenyl)azo)-3-((4-nitrophenyl)azo)phenyl)azo)-5-hydroxynaphthalene-2,7-disulphonate EINECS 229-637-4 NSC 47740