[(R)-1-(2-Amino-ethyl)-piperidin-3-yl]-cyclopropyl-carbamic acid benzyl ester

{4-[(2-Amino-acetyl)-cyclopropyl-amino]-cyclohexyl}-carbamic acid tert-butyl ester

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

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

(S)-3-[((S)-2-Amino-propionyl)-methyl-amino]-pyrrolidine-1-carboxylic acid tert-butyl ester

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

3-[((S)-2-Amino-propionyl)-ethyl-amino]-pyrrolidine-1-carboxylic acid tert-butyl ester

(S)-3-[((S)-2-Amino-propionyl)-ethyl-amino]-pyrrolidine-1-carboxylic acid tert-butyl ester

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

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

(1R,4R)-{4-[((S)-2-Amino-propionyl)-isopropyl-amino]-cyclohexyl}-carbamic acid tert-butyl ester