trans-4-hydroxy-D-proline ethyl ester hydrochloride

(2R,4S)-4-羟基吡咯烷-2-羧酸

N-Boc-反式-4-羟基-D-脯氨酸

(4S)-4-羟基-D-脯氨酸甲酯

2-(R)-乙氧羰基-4-(R)-羟基吡咯烷