tert-butyl N-(tert-butoxycarbonyl)-5-nitro-4-oxo-L-norvalinate

(2S,4R)-tert-butyl 2-((tert-butoxycarbonyl)amino)-4-hydroxy-5-nitropentanoate

苯甲氧羰酰琥珀酰亚胺

benzyl (R)-5-((S)-2-amino-3-(tert-butoxy)-3-oxopropyl)-2,2-dimethyloxazolidine-3-carboxylate