3-[((S)-2-Amino-propionyl)-cyclopropyl-amino]-pyrrolidine-1-carboxylic acid tert-butyl ester

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

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

[(2-Benzyloxycarbonylamino-cyclohexyl)-ethyl-amino]-acetic acid

2-[(Carboxymethyl-isopropyl-amino)-methyl]-piperidine-1-carboxylic acid benzyl ester

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

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

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

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

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

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