p. 1740 - 1742
(1989)(S)-2-Amino-N-((R)-1-hydroxy-2-oxo-pyrrolidin-3-yl)-3-phenyl-propionamide
(S)-2-Amino-N-((S)-1-hydroxy-2-oxo-pyrrolidin-3-yl)-3-phenyl-propionamide
tert-butyl [(1S)-2-[(2-dimethylamino)ethyl]amino]-2-oxo-1-(phenylmethyl)ethylcarbamate
[(S)-1-((R)-1-Hydroxy-2-oxo-pyrrolidin-3-ylcarbamoyl)-2-phenyl-ethyl]-carbamic acid tert-butyl ester
[(S)-1-((S)-1-Hydroxy-2-oxo-pyrrolidin-3-ylcarbamoyl)-2-phenyl-ethyl]-carbamic acid tert-butyl ester