67815-66-1 7-Amino-4-hydroxy-8-((4-nitro-2-carboxyphenyl)azo)-2-naphthalenesulfonic acid, monosodium salt Benzoic acid, 2-((2-amino-5-hydroxy-7-sulfo-1-naphthalenyl)azo)-5-nitro-, monosodium salt EINECS 267-194-9 Sodium hydrogen 2-((2-amino-5-hydroxy-7-sulphonato-1-naphthyl)azo)-5-nitrobenzoate