(S)-2-Amino-N-((S)-1-benzyl-piperidin-3-yl)-N-cyclopropyl-propionamide

(S)-2-Amino-N-(1-benzyl-piperidin-2-ylmethyl)-N-isopropyl-3-methyl-butyramide

(S)-2-Amino-N-((S)-1-benzyl-piperidin-3-yl)-N-cyclopropyl-3-methyl-butyramide

((S)-1-Acetyl-piperidin-3-ylamino)-acetic acid

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

[(1-Acetyl-piperidin-4-ylmethyl)-methyl-amino]-acetic acid

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

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

[(1-Acetyl-piperidin-4-yl)-cyclopropyl-amino]-acetic acid

[((R)-1-Acetyl-piperidin-3-yl)-cyclopropyl-amino]-acetic acid

1-{2-[(2-Hydroxy-ethylamino)-methyl]-pyrrolidin-1-yl}-ethanone