1-Ethyl-2,3-dimethylimidazolium bis(trifluoromethanesulfonyl)imide174899-90-235 % similar 1-(2-Hydroxyethyl)-3-methylimidazolium Bis(trifluoromethanesulfonyl)imide174899-86-633 % similar 1-Allyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide655249-87-933 % similar Tetrabutylammonium hydrogen sulfate32503-27-831 % similar