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

3-{[(2-Amino-acetyl)-cyclopropyl-amino]-methyl}-pyrrolidine-1-carboxylic acid benzyl ester

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

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

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

[2-((S)-2-Amino-propionylamino)-cyclohexyl]-carbamic acid benzyl ester

4-[((S)-2-Amino-propionyl)-methyl-amino]-piperidine-1-carboxylic acid benzyl ester

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

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

{2-[((S)-2-Amino-propionyl)-ethyl-amino]-cyclohexyl}-carbamic acid benzyl ester

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