1-tert-butyl (S)-2-[N-(tert-butoxycarbonyl)amino]-4-oxobutanoate

N-(叔丁氧基羰基)-(s)-高丝氨酸叔丁酯

N-叔丁氧羰基-L-天冬氨酸 1-叔丁酯

tert-butyl (S)-1-[(S)-3-benzyloxycarbonylamino-4-tert-butoxy-4-oxobutyl]azetidine-2-carboxylate

(S)-tert-butyl 1-((S)-4-(tert-butoxy)-3-((tert-butoxycarbonyl)amino)-4-oxobutyl)azetidine-2-carboxylate