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

[4-((S)-2-Amino-3-methyl-butyrylamino)-cyclohexyl]-carbamic acid benzyl ester

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

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

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

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

[((S)-1-Benzyl-piperidin-3-yl)-methyl-amino]-acetic acid

[((R)-1-Benzyl-piperidin-3-yl)-methyl-amino]-acetic acid

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

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

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