1-Butyl-3-methylimidazolium trifluoromethansulfonate (CAS NO.174899-66-2) is also named as 1-butyl-3-methyl-1H-imidazol-3-ium trifluoromethanesulfonate ; 1-Butyl-3-methylimidazolium Trifluoromethanesulfonate ; 1-n-Butyl-3-methylimidazolium triflate . 1-Butyl-3-methylimidazolium trifluoromethansulfonate (CAS NO.174899-66-2) is clear pale yellow to yellow liquid.