2,7-Naphthalenedisulfonic acid, 4-((3,5-bis((3-amino-4-nitrophenyl)azo)-2,4-dihydroxyphenyl)azo)-5-hydroxy-, disodium salt 6473-02-5 Disodium 4-((3,5-bis((3-amino-4-nitrophenyl)azo)-2,4-dihydroxyphenyl)azo)-5-hydroxynaphthalene-2,7-disulphonate EINECS 229-324-2