(S)-2-Amino-N-[4-(benzyl-isopropyl-amino)-cyclohexyl]-3-methyl-butyramide

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

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

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

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

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

(1R,4R)-[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

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

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

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

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

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

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

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