Synonyms: Benzenesulfonicacid,2,5-dichloro-4-[4-[[5-[(4,6-dichloro-1,3,5-triazin-2-yl)amino]-2-sulfophenyl]azo]-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl]-(9CI); C.I. Reactive Yellow 1 (8CI); Sulfanilic acid,2-[1-(2,5-dichloro-4-sulfophenyl)-3-methyl-5-oxo-2-pyrazolin-4-ylazo]-N-(4,6-dichloro-s-triazin-2-yl)-(6CI)