(R)-3-(Carboxymethyl-ethyl-amino)-piperidine-1-carboxylic acid benzyl ester

3-(Carboxymethyl-cyclopropyl-amino)-piperidine-1-carboxylic acid benzyl ester

(1R,4R)-[(4-Benzyloxycarbonylamino-cyclohexyl)-cyclopropyl-amino]-acetic acid

2-{[(2-Hydroxy-ethyl)-methyl-amino]-methyl}-pyrrolidine-1-carboxylic acid benzyl ester

{2-[(2-Hydroxy-ethyl)-methyl-amino]-cyclohexyl}-carbamic acid benzyl ester

(S)-3-[Ethyl-(2-hydroxy-ethyl)-amino]-piperidine-1-carboxylic acid benzyl ester

(1R,4R)-{4-[Ethyl-(2-hydroxy-ethyl)-amino]-cyclohexyl}-carbamic acid benzyl ester

3-[(2-Hydroxy-ethyl)-isopropyl-amino]-piperidine-1-carboxylic acid benzyl ester

4-{[(2-Hydroxy-ethyl)-isopropyl-amino]-methyl}-piperidine-1-carboxylic acid benzyl ester

(S)-3-[Cyclopropyl-(2-hydroxy-ethyl)-amino]-pyrrolidine-1-carboxylic acid benzyl ester

4-[Cyclopropyl-(2-hydroxy-ethyl)-amino]-piperidine-1-carboxylic acid benzyl ester