(2S)-2-(双(叔丁氧羰基)氨基)-5-氧代戊酸甲酯

N-叔丁氧羰基-L-谷氨酸二甲酯

(S)-2-tert-Butoxycarbonylamino-3-(5,7-dimethyl-1H-indol-3-yl)-propionic acid methyl ester

(2S,5S)-5-Carboxymethyl-pyrrolidine-2-carboxylic acid methyl ester