Synonyms: EINECS 228-320-8;Disodium 3-hydroxy-4-((2-methyl-4-((o-tolyl)azo)phenyl)azo)naphthalene-2,7-disulphonate;2,7-Naphthalenedisulfonic acid, 3-hydroxy-4-((2-methyl-4-((2-methylphenyl)azo)phenyl)azo)-, disodium salt;2,7-Naphthalenedisulfonic acid, 3-hydroxy-4-(2-(2-methyl-4-(2-(2-methylphenyl)diazenyl)phenyl)diazenyl)-, sodium salt (1:2);6226-80-8;8005-61-6