(2S)-2-(2-Oxopyrrolidin-1-yl)butanoic acid;Levetiracetam Carboxylic Acid;1-Pyrrolidineaceticacid, a-ethyl-2-oxo-, (S)-;2-Pyrrolidinone-n-butyric acid;UCB-L 057;LevetiracetaM Metabolite;(S)-Levetiracetam EP Impurity A;S,2-Ethyl 2-oxo pyrolidine acetic acid;(S)-2-(2-OXOPYRROLIDIN-1-YL)BUTANOIC ACID;(αS)-α-Ethyl-2-oxo-1-pyrrolidineacetic Acid;(S)-2-(2-OXO-PYRROLIDIN-1-YL)-BUTYRIC ACID;(S)-2-(2-oxopyrrolidin-1-yl)-2-butanoic acid;(S)-alpha-Ethyl-2-oxo-1-pyrrolidineacetic acid;(2S)-2-(2-Oxopyrrolidin-1-yl)butanoic acidSynonyMs;2-(2-Oxopyrrolidin-1-yl)butanoic acid, (2S)-;1-Pyrrolidineacetic acid, alpha-ethyl-2-oxo-, (alphaS)-;(2S)-2-(2-Oxopyrrolidin-1-yl)butanoicacid;(2s)-2- (2- oxopyrrolidin -1-yl) butanoic acid;S19061909R;(2S)-2-(2-oxo-1-pyrrolidinyl)butanoic acid;(S)-Levetiracetam acid;Levetiracetam acid, (-)-;Leve