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

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

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

(R)-3-(Carboxymethyl-ethyl-amino)-pyrrolidine-1-carboxylic acid benzyl ester

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

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

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

[(2-Benzyloxycarbonylamino-cyclohexyl)-isopropyl-amino]-acetic acid

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

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

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