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EI-0120 (OTTO) 1-Ethyl-3-methylimidazolium bis(pentafluoroethylsulfonyl)imide, ≥97.0% (H-NMR) Cas 216299-76-2 - used in the studies of solubility and absorption of 1,1,1,2-tetrafluoroethane, difluoromethane, and fluorinated ethanes in ionic liquids.