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

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

2-[(Carboxymethyl-ethyl-amino)-methyl]-piperidine-1-carboxylic acid tert-butyl ester

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

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

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

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

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

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

4-{[(2-Chloro-acetyl)-methyl-amino]-methyl}-piperidine-1-carboxylic acid tert-butyl ester

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