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

(S)-2-Amino-1-{(S)-2-[(benzyl-cyclopropyl-amino)-methyl]-pyrrolidin-1-yl}-3-methyl-butan-1-one

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

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

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

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

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

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

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

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

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