EI-0190 (OTTO) 1-Ethyl-3-methylimidazolium ethyl sulfate, ≥95% Cas 342573-75-5 - used to study its effect as a solvent on the thermal stability of lysozyme. EI-0190 (OTTO) 1-Ethyl-3-methylimidazolium ethyl sulfate, ≥95% Cas 342573-75-5 - used to study its effect As an additive on potassium hydroxide (KOH) electrolyte properties and hydrogen evolution reaction (HER) reaction kinetics.