N-苄氧羰基-L-脯氨酸

L-脯氨醇

L-焦谷氨酸

(2R,5S)-2-trichloromethyl-1-aza-3-oxabicyclo[3.3.0]octane-4,8-dione

(S)(-)-N,O-bis(p-toluenesulphonyl)-2-hydroxymethyl pyrrolidine