2-{[((S)-2-Amino-3-methyl-butyryl)-isopropyl-amino]-methyl}-piperidine-1-carboxylic acid tert-butyl ester

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

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

(S)-2-[(Carboxymethyl-isopropyl-amino)-methyl]-pyrrolidine-1-carboxylic acid benzyl ester

(S)-3-(Carboxymethyl-isopropyl-amino)-pyrrolidine-1-carboxylic acid benzyl ester

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

2-[(Carboxymethyl-cyclopropyl-amino)-methyl]-pyrrolidine-1-carboxylic acid benzyl ester

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

(S)-3-[(2-Hydroxy-ethyl)-methyl-amino]-pyrrolidine-1-carboxylic acid benzyl ester

4-{[(2-Hydroxy-ethyl)-methyl-amino]-methyl}-piperidine-1-carboxylic acid benzyl ester

S)-3-[Ethyl-(2-hydroxy-ethyl)-amino]-pyrrolidine-1-carboxylic acid benzyl ester