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

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

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

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

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

[(1-Benzyl-piperidin-4-yl)-methyl-amino]-acetic acid

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

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

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

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

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