1-(2-Amino-acetyl)-piperidin-4-one

(S)-3-(2-Amino-acetylamino)-piperidine-1-carboxylic acid tert-butyl ester

[2-(2-Amino-acetylamino)-cyclohexyl]-carbamic acid tert-butyl ester

{4-[(2-Amino-acetyl)-methyl-amino]-cyclohexyl}-carbamic acid tert-butyl ester

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