1-Naphthalenesulfonic acid, 4-((4-((2,4-diaminophenyl)azo)-1-naphthalenyl)azo)-, monosodium salt 10115-25-0 EINECS 233-318-5 Sodium 4-((4-((2,4-diaminophenyl)azo)naphthyl)azo)naphthalene-1-sulphonate