(S)-2-Amino-N-(1-benzyl-piperidin-4-yl)-N-isopropyl-propionamide

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

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

(S)-2-Amino-N-(1-benzyl-piperidin-4-ylmethyl)-N-isopropyl-3-methyl-butyramide

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

(1R,4R)- (4-Acetylamino-cyclohexylamino)-acetic acid

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

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

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

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

[(1-Acetyl-pyrrolidin-2-ylmethyl)-cyclopropyl-amino]-acetic acid