Synonyms: trisodium 5-[[5-[[4-chloro-6-[(3-sulphonatophenyl)amino]-1,3,5-triazin-2-yl]amino]-2-sulphonatophenyl]azo]-1-ethyl-1,2-dihydro-6-hydroxy-4-methyl-2-oxopyridine-3-methanesulphonate;3-Pyridinemethanesulfonic acid, 5-5-4-chloro-6-(3-sulfophenyl)amino-1,3,5-triazin-2-ylamino-2-sulfophenylazo-1-ethyl-1,2-dihydro-6-hydroxy-4-methyl-2-oxo-, trisodium salt;2-(1-Ethyl-1,2-dihydro-6-hydroxy-4-methyl-2-oxo-3-sulfomethylpyridin-5-ylazo)-4-[6-chloro-4-(3-sulfoanilino)-1,3,5-triazin-2-ylamino]benzenesulfonic acid trisodium salt;5-[3-[[6-(3-Sodiosulfoanilino)-2-chloro-1,3,5-triazin-4-yl]amino]-6-sodiosulfophenylazo]-1-ethyl-6-hydroxy-4-methyl-3-sodiosulfomethyl-2(1H)-pyridone;Einecs 281-865-3;Trisodium 5-((5-((4-chloro-6-((3-sulphonatophenyl)amino)-1,3,5-triazin-2-yl)amino)-2-sulphonatophenyl)azo)-1-ethyl-1,2-dihydro-6-hydroxy-4-methyl-2-oxopyridine-3-methanesulphonate