Synonyms: trisodium 5-[[4-chloro-6-(ethylphenylamino)-1,3,5-triazin-2-yl]amino]-4-hydroxy-3-[(1-sulphonato-2-naphthyl)azo]naphthalene-2,7-disulphonate;2,7-Naphthalenedisulfonic acid, 5-4-chloro-6-(ethylphenylamino)-1,3,5-triazin-2-ylamino-4-hydroxy-3-(1-sulfo-2-naphthalenyl)azo-, trisodium salt;5-[4-Chloro-6-(N-ethylanilino)-1,3,5-triazin-2-ylamino]-4-hydroxy[2',3-azobisnaphthalene]-1',2,7-trisulfonic acid trisodium salt;5-[4-Chloro-6-(N-ethylanilino)-1,3,5-triazin-2-ylamino]-4-hydroxy-3-[1-(sodiosulfo)-2-naphtylazo]-2,7-naphthalenedisulfonic acid disodium salt