(S)-2-(2-Hydroxy-ethylsulfanylmethyl)-pyrrolidine-1-carboxylic acid benzyl ester

(S)-3-(Carboxymethyl-ethyl-amino)-pyrrolidine-1-carboxylic acid tert-butyl ester

3-(Carboxymethyl-ethyl-amino)-piperidine-1-carboxylic acid tert-butyl ester

3-(Carboxymethyl-isopropyl-amino)-pyrrolidine-1-carboxylic acid tert-butyl ester

3-(Carboxymethyl-isopropyl-amino)-piperidine-1-carboxylic acid tert-butyl ester

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

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