4-{[((S)-2-Amino-propionyl)-cyclopropyl-amino]-methyl}-piperidine-1-carboxylic acid tert-butyl ester

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

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

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

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

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

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

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

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

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

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