2,7-Naphthalenedisulfonic acid, 4-((5-((3-amino-4-nitrophenyl)azo)-2,4-dihydroxyphenyl)azo)-5-hydroxy-, disodium salt 5-((5-((3-Amino-4-nitrophenyl)azo)-2,4-dihydroxyphenyl)azo)-4-hydroxy-2,7-naphthalenedisulfonic acid, disodium salt 72828-77-4 Disodium 4-((5-((3-amino-4-nitrophenyl)azo)-2,4-dihydroxyphenyl)azo)-5-hydroxynaphthalene-2,7-disulphonate EINECS 276-888-0