3-((S)-2-Amino-propionylamino)-pyrrolidine-1-carboxylic acid benzyl ester

(S)-2-{[((S)-2-Amino-propionyl)-isopropyl-amino]-methyl}-pyrrolidine-1-carboxylic acid benzyl ester

(R)-3-[((S)-2-Amino-propionyl)-cyclopropyl-amino]-pyrrolidine-1-carboxylic acid benzyl ester

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

(S)-3-((S)-2-Amino-3-methyl-butyrylamino)-pyrrolidine-1-carboxylic acid benzyl ester

(R)-3-[((S)-2-Amino-3-methyl-butyryl)-methyl-amino]-piperidine-1-carboxylic acid benzyl ester

4-[((S)-2-Amino-3-methyl-butyryl)-methyl-amino]-piperidine-1-carboxylic acid benzyl ester

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

{4-[((S)-2-Amino-3-methyl-butyryl)-ethyl-amino]-cyclohexyl}-carbamic acid benzyl ester

((S)-1-Benzyl-piperidin-3-ylamino)-acetic acid

[(1-Benzyl-piperidin-4-yl)-methyl-amino]-acetic acid