3-(2-Hydroxy-ethylsulfanyl)-piperidine-1-carboxylic acid benzyl ester

(1R,4R)-[(4-tert-Butoxycarbonylamino-cyclohexyl)-ethyl-amino]-acetic acid

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

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

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

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

4-[(Carboxymethyl-cyclopropyl-amino)-methyl]-piperidine-1-carboxylic acid tert-butyl ester

(S)-2-[(2-Chloro-acetylamino)-methyl]-pyrrolidine-1-carboxylic acid tert-butyl ester

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

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

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