EI-0310 (OTTO) 1-Ethyl-3-methylimidazolium trifluoromethanesulfonate, ≥98% (H-NMR) Cas 145022-44-2 - used as a solvent to produce ionic polymer-polymer composites (IP2C) and also in lipase-catalyzed enantioselective amine acylation with 4-pentenoic acid.