1-Benzyl 2-methyl (2S)-5-oxo-1,2-pyrrolidinedicarboxylate

(S)-4-((((9h-芴-9-基)甲氧基)羰基)氨基)-2-(((苄氧基)甲基)氨基)丁酸

1-O-benzyl 2-O-methyl (2S)-5-oxopiperidine-1,2-dicarboxylate

benzyl N-[(3S)-2-oxopyrrolidin-3-yl]carbamate

(S)-2-(((苄氧基)羰基)氨基)-4-((叔丁氧基羰基)氨基)丁酸