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

{4-[((S)-2-Amino-3-methyl-butyryl)-cyclopropyl-amino]-cyclohexyl}-carbamic acid tert-butyl ester

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

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

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

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

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

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

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

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

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

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

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

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

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