二碳酸二叔丁酯

L-羟基脯氨酸

(2R,4S)-4-羟基吡咯烷-2-羧酸

(2R)-N-Boc-trans-4-acetoxy-D-proline ethyl ester

(2R,4R)-4-hydroxyproline-1,2-dicarboxylic acid 1-tert-butyl 2-ethyl ester