2-Methyl-2-propanyl (5S)-6-oxo-7-[(1R)-1-phenylethyl]-1,7-diazasp iro[4.4]nonane-1-carboxylate

1-tert-butyl 2-methyl 2-(2-oxoethyl)pyrrolidine-1,2-dicarboxylate

methyl (2S)-2-pyrrolidinecarboxylate

Boc-L-脯氨酸甲酯

1-tert-butyl 2-methyl 2-allylpyrrolidine-1,2-dicarboxylate