(S)-2-Amino-N-(1-benzyl-piperidin-4-yl)-3,N-dimethyl-butyramide

[1-(2-Chloro-acetyl)-piperidin-4-ylmethyl]-ethyl-carbamic acid tert-butyl ester

[(S)-1-(2-Chloro-acetyl)-piperidin-3-yl]-isopropyl-carbamic acid tert-butyl ester

[(R)-1-(2-Amino-ethyl)-piperidin-3-yl]-cyclopropyl-carbamic acid benzyl ester

2-Amino-1-[(R)-3-(benzyl-cyclopropyl-amino)-pyrrolidin-1-yl]-ethanone

2-Amino-1-{4-[(benzyl-cyclopropyl-amino)-methyl]-piperidin-1-yl}-ethanone

(S)-2-Amino-1-{2-[(benzyl-cyclopropyl-amino)-methyl]-pyrrolidin-1-yl}-3-methyl-butan-1-one

(S)-3-[(2-Amino-acetyl)-isopropyl-amino]-piperidine-1-carboxylic acid tert-butyl ester

2-{[(2-Amino-acetyl)-isopropyl-amino]-methyl}-piperidine-1-carboxylic acid tert-butyl ester

(S)-3-[(2-Amino-acetyl)-cyclopropyl-amino]-piperidine-1-carboxylic acid tert-butyl ester

3-[((S)-2-Amino-propionylamino)-methyl]-piperidine-1-carboxylic acid tert-butyl ester