(S)-2-[(Carboxymethyl-amino)-methyl]-pyrrolidine-1-carboxylic acid tert-butyl ester

3-[(Carboxymethyl-cyclopropyl-amino)-methyl]-pyrrolidine-1-carboxylic acid tert-butyl ester

[(4-tert-Butoxycarbonylamino-cyclohexyl)-cyclopropyl-amino]-acetic acid

3-(2-Chloro-acetylamino)-piperidine-1-carboxylic acid tert-butyl ester

3-[(2-Chloro-acetylamino)-methyl]-piperidine-1-carboxylic acid tert-butyl ester

(R)-3-(2-Chloro-acetylamino)-pyrrolidine-1-carboxylic acid tert-butyl ester

{2-[(2-Chloro-acetyl)-methyl-amino]-cyclohexyl}-carbamic acid tert-butyl ester

3-[(2-Chloro-acetyl)-ethyl-amino]-pyrrolidine-1-carboxylic acid tert-butyl ester

3-{[(2-Chloro-acetyl)-ethyl-amino]-methyl}-pyrrolidine-1-carboxylic acid tert-butyl ester

{2-[(2-Chloro-acetyl)-ethyl-amino]-cyclohexyl}-carbamic acid tert-butyl ester

3-[(2-Chloro-acetyl)-isopropyl-amino]-pyrrolidine-1-carboxylic acid tert-butyl ester