(-)-1-(but-1-enyl)-5-ethoxycarbonylpyrrolidin-2-one

L-焦谷氨酸乙酯

(4S,5R)-methyl 4-((tert-butoxycarbonyl)amino)-5,6-dihydroxyhexanoate

(S)-4-tert-Butoxycarbonylamino-4-((R)-2,2-dimethyl-[1,3]dioxolan-4-yl)-butyric acid methyl ester

methyl (4R)-4-(methoxycarbonylamino)-6-methylthio-2-hexenoate