2,7-Naphthalenedisulfonic acid, 4-amino-3,6-bis((4-aminophenyl)azo)-5-hydroxy-, disodium salt 4-Amino-3,6-bis((4'-aminophenyl)azo)-5-hydroxy-2,7-naphthalenedisulfonic acid, disodium salt 72906-46-8 Disodium 4-amino-3,6-bis((4-aminophenyl)azo)-5-hydroxynaphthalene-2,7-disulphonate EINECS 277-004-6