(2R)-2-(2-oxopyrrolidin-1-yl)butanamide (2R)-2-(2-oxo-1-pyrrolidinyl)butanamide (2R)-2-(2-ketopyrrolidin-1-yl)butyramide 102767-28-2 C07841 D00709 Keppra (TN) Levetiracetam (JAN/USAN/INN) STOCK1N-71378