(1R-4S)-4-[[(1,1-二甲基乙氧基)羰基]氨基]- 2-环戊烯-1-羧酸甲酯

(3R,4S)-4-tert-butoxycarbonylamino-3-hydroxycyclopent-1-enecarboxylic acid methyl ester

(3R,4S)-4-tert-butoxycarbonylamino-3-hydroxycyclopent-1-enecarboxylic acid

二碳酸二叔丁酯

(3aS,5S,6S,6aS)-6-bromo-2-oxo-hexahydrocyclopentaoxazole-5-carboxylic acid methyl ester