Cbz-L-Pro-Bt

L-缬氨酸

Z-Pro-Val-OBzl

N-苄氧羰基-L-脯氨酸

1-benzyl 2-(2,4-dioxo-3-azaspiro[5.5]undecan-3-yl) (S)-pyrrolidine-1,2-dicarboxylate