(6S)-1,1-dibromo-5-(tert-butoxycarbonyl)-5-azaspiro[2.4]heptane-6-carboxylic acid

5-O-tert-butyl 6-O-methyl (6S)-5-azaspiro[2.4]heptane-5,6-dicarboxylate

(S)-tert-butyl 6-(hydroxymethyl)-5-azaspiro[2.4]heptane-5-carboxylate

(S)-1-(叔丁氧基羰基)-2-甲基-4-亚甲基吡咯烷-2-羧酸

N-Boc-4-亚甲基-L-脯氨酸