1-Ethyl-2,3-dimethylimidazolium hexafluorophosphate292140-86-431 % similar 1-Butyl-1-methylpyrrolidinium hexafluorophosphate330671-29-931 % similar 1-Allyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide655249-87-931 % similar 1-Ethyl-3-methylimidazolium P-toluenesulfonate328090-25-130 % similar Butylimidazole4316-42-130 % similar