Synonyms: sodium 3-[[4-[(2-hydroxy-5-methylphenyl)azo]-1-naphthyl]azo]benzenesulphonate;Benzenesulfonic acid, 3-[[4-[(2-hydroxy-5-methylphenyl) azo]-1-naphthalenyl]azo]-, monosodium salt;3-((4-((2-Hydroxy-5-methylphenyl)azo)-1-naphthyl)azo)benzenesulfonic acid, sodium salt;Benzenesulfonic acid, 3-((4-((2-hydroxy-4-methylphenyl)azo)-1-naphthyl)azo)-, monosodium salt;Benzenesulfonic acid, 3-((4-((2-hydroxy-5-methylphenyl)azo)-1-naphthalenyl)azo)-, sodium salt;Benzenesulfonic acid, 3-(2-(4-(2-(2-hydroxy-5-methylphenyl)diazenyl)-1-naphthalenyl)diazenyl)-, sodium salt (1:1);Einecs 267-536-7