methyl 4-bromo-5,6-O-isopropylidene-2,3,4-trideoxy-D-threo-hexonate

(S)-4-azido-4-((S)-2,2-dimethyl-1,3-dioxolan-4-yl)butanal

methyl (S)-4-azido-4-((S)-2,2-dimethyl-1,3-dioxolan-4-yl)butanoate

N-Cbz-L-脯氨酸叔丁酯

N-苄氧羰基-L-脯氨酸