Levetiracetam acid103833-72-332 % similar 1-(Trimethylsilyl)-2-pyrrolidinone14468-90-732 % similar N-Methyl-2-pyrrolidone872-50-432 % similar 1-Benzyl-3-pyrrolidone5291-77-031 % similar Deferoxamine mesylate138-14-731 % similar Levetiracetam102767-28-231 % similar Alpha-ethyl-2-oxo-1-Pyrrolidineacetamide33996-58-631 % similar Lauric acid diethanolamide120-40-131 % similar 2-Pyrrolidone616-45-530 % similar