英文别名Oxiracetam Impurity 4; 4-Hydroxy-2-oxo-1-pyrrolidineacetic acid; oxiracetam related substance ISF3138; 1-Pyrrolidineacetic acid, 4-hydroxy-2-oxo-; Oxiracetam Imp.ISF3138; (4-Hydroxy-2-oxo-1-pyrrolidinyl)acetic acid; Oxiracetam Impurity B; Oxiracetam Impurity 7; 4-hydroxy-2-oxopyrrolidin-1-yl-acetic acid; 4-hydroxy-2-oxo-1-pyrrolidine acetic acid 
