Synonym
(2RS)-2-(2-Oxopyrrolidin-1-yl)butanoic acid|(2RS)-2-(2-Oxopyrrolidin-1-yl)butanoic acid ;|2-(2-oxopyrrolidin-1-yl)butanoic acid|2-Pyrrolidone-N-butyric Acid|Etiracetam Carboxylic Acid;|Levetiracetam Carboxylic Acid Racemate ;|Levetiracetam Impurity A|α-Ethyl-2-oxo-1-pyrrolidineacetic Acid