(S)-3-[((S)-2-Amino-3-methyl-butyryl)-cyclopropyl-amino]-piperidine-1-carboxylic acid tert-butyl ester

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

(R)-3-(Carboxymethyl-isopropyl-amino)-pyrrolidine-1-carboxylic acid benzyl ester

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

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

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

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

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

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

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

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