3-(2-Amino-acetylamino)-pyrrolidine-1-carboxylic acid benzyl ester

(R)-3-[(2-Amino-acetyl)-methyl-amino]-piperidine-1-carboxylic acid benzyl ester

3-[(2-Amino-acetyl)-ethyl-amino]-piperidine-1-carboxylic acid benzyl ester

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

4-[(2-Amino-acetyl)-isopropyl-amino]-piperidine-1-carboxylic acid benzyl ester

(R)-3-[(2-Amino-acetyl)-isopropyl-amino]-piperidine-1-carboxylic acid benzyl ester

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

(S)-3-[(2-Amino-acetyl)-cyclopropyl-amino]-piperidine-1-carboxylic acid benzyl ester

{2-[(2-Amino-acetyl)-cyclopropyl-amino]-cyclohexyl}-carbamic acid benzyl ester

4-((S)-2-Amino-propionylamino)-piperidine-1-carboxylic acid benzyl ester

(S)-3-((S)-2-Amino-propionylamino)-pyrrolidine-1-carboxylic acid benzyl ester