Synonyms: trisodium 5-[[4-chloro-6-(methylphenylamino)-1,3,5-triazin-2-yl]amino]-4-hydroxy-3-[(4-methoxy-2-sulphonatophenyl)azo]naphthalene-2,7-disulphonate;2,7-Naphthalenedisulfonic acid, 5-4-chloro-6-(methylphenylamino)-1,3,5-triazin-2-ylamino-4-hydroxy-3-(4-methoxy-2-sulfophenyl)azo-, trisodium salt;4-[2-Chloro-6-(N-methylanilino)-1,3,5-triazin-4-ylamino]-5-hydroxy-6-(4-methoxy-2-sodiosulfophenylazo)-2,7-naphthalenedisulfonic acid disodium salt;5-[4-Chloro-6-(N-methylanilino)-1,3,5-triazin-2-ylamino]-4-hydroxy-3-[4-methoxy-2-(sodiosulfo)phenylazo]-2,7-naphthalenedisulfonic acid disodium salt