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

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

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

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

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

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

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

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

[(1-Benzyl-pyrrolidin-3-ylmethyl)-amino]-acetic acid

[(1-Benzyl-piperidin-3-ylmethyl)-amino]-acetic acid

[((S)-1-Benzyl-piperidin-3-yl)-methyl-amino]-acetic acid