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

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

3-{[(2-Amino-acetyl)-ethyl-amino]-methyl}-piperidine-1-carboxylic acid tert-butyl ester

4-(Carboxymethyl-methyl-amino)-piperidine-1-carboxylic acid benzyl ester

(1R,4R)-[(4-Benzyloxycarbonylamino-cyclohexyl)-methyl-amino]-acetic acid

[(4-Benzyloxycarbonylamino-cyclohexyl)-methyl-amino]-acetic acid

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

(S)-2-Amino-N-(1-benzyl-pyrrolidin-3-ylmethyl)-3,N-dimethyl-butyramide

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

[1-(2-Chloro-acetyl)-piperidin-3-ylmethyl]-ethyl-carbamic acid tert-butyl ester

[(S)-1-(2-Chloro-acetyl)-pyrrolidin-2-ylmethyl]-isopropyl-carbamic acid tert-butyl ester