1,3-Naphthalenedisulfonic acid, 6-((4-aminophenyl)azo)-, disodium salt 1,3-Naphthalenedisulfonic acid, 6-((p-aminophenyl)azo)-, disodium salt 67875-26-7 Disodium 6-((4-aminophenyl)azo)naphthalene-1,3-disulphonate EINECS 267-541-4