(R)-2-(2-oxopyrrolidin-1-yl)butanoicacid; (2R)-2-(2-oxopyrrolidin-1-yl)butanoic acid; (R)-2-(2-Oxo-1-pyrrolidinyl)butyric acid; (2R)-2-(2-oxo-1-pyrrolidinyl)butanoic acid; (2r)-2-(2-oxo-pyrrolidin-1-yl)-butanoic acid; (R)-alpha-ethyl-2-oxo-1-pyrrolidineacetic acid
