(S)-tert-butyl 2-(azidomethyl)-5-oxopyrrolidine-1-carboxylate

(S)-4-叔丁氧羰基氨基-5-羟基戊酸甲酯

(S)-methyl 4-((tert-butoxycarbonyl)amino)-5-((methylsulfonyl)oxy)pentanoate