(1R,4R)-[4-((S)-2-Amino-propionylamino)-cyclohexyl]-carbamic acid benzyl ester

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

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

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

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

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

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

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

(1R,4R)-{4-[((S)-2-Amino-3-methyl-butyryl)-ethyl-amino]-cyclohexyl}-carbamic acid benzyl ester

[((S)-1-Benzyl-pyrrolidin-2-ylmethyl)-amino]-acetic acid

[((R)-1-Benzyl-pyrrolidin-3-yl)-methyl-amino]-acetic acid