2-Amino-1-[(R)-3-(benzyl-cyclopropyl-amino)-pyrrolidin-1-yl]-ethanone

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

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

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

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

[4-((S)-2-Amino-propionylamino)-cyclohexyl]-carbamic acid tert-butyl ester

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

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

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

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

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