Synonyms: trisodium 2-[[4-[[4-[(4,6-dichloro-1,3,5-triazin-2-yl)amino]-5-sulphonato-1-naphthyl]azo]-2,5-dimethylphenyl]azo]benzene-1,4-disulphonate;1,4-Benzenedisulfonic acid, 2-4-4-(4,6-dichloro-1,3,5-triazin-2-yl)amino-5-sulfo-1-naphthalenylazo-2,5-dimethylphenylazo-, trisodium salt