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

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

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

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

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

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

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

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

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

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

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