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

2-[((S)-2-Amino-3-methyl-butyrylamino)-methyl]-pyrrolidine-1-carboxylic acid benzyl ester

4-((S)-2-Amino-3-methyl-butyrylamino)-piperidine-1-carboxylic acid benzyl ester

4-{[((S)-2-Amino-3-methyl-butyryl)-methyl-amino]-methyl}-piperidine-1-carboxylic acid benzyl ester

4-[((S)-2-Amino-3-methyl-butyryl)-ethyl-amino]-piperidine-1-carboxylic acid benzyl ester

(1R,4R)-{4-[((S)-2-Amino-3-methyl-butyryl)-ethyl-amino]-cyclohexyl}-carbamic acid benzyl ester

[(1-Benzyl-piperidin-3-ylmethyl)-amino]-acetic acid

[(1-Benzyl-pyrrolidin-2-ylmethyl)-methyl-amino]-acetic acid

[((R)-1-Benzyl-pyrrolidin-3-yl)-ethyl-amino]-acetic acid

[((R)-1-Benzyl-pyrrolidin-3-yl)-isopropyl-amino]-acetic acid

[(1-Benzyl-piperidin-4-ylmethyl)-isopropyl-amino]-acetic acid