(1R,4R)-{4-[(2-Chloro-acetyl)-isopropyl-amino]-cyclohexyl}-carbamic acid benzyl ester

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

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

[4-(2-Amino-acetylamino)-cyclohexyl]-carbamic acid benzyl ester

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

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

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

{4-[(2-Amino-acetyl)-isopropyl-amino]-cyclohexyl}-carbamic acid benzyl ester

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

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

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