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

[(S)-1-((S)-2-Amino-propionyl)-piperidin-3-yl]-cyclopropyl-carbamic acid tert-butyl ester

[(S)-1-((S)-2-Amino-3-methyl-butyryl)-piperidin-3-yl]-carbamic acid tert-butyl ester

[1-((S)-2-Amino-3-methyl-butyryl)-piperidin-4-yl]-carbamic acid tert-butyl ester

[1-((S)-2-Amino-3-methyl-butyryl)-piperidin-4-ylmethyl]-methyl-carbamic acid tert-butyl ester

[1-((S)-2-Amino-3-methyl-butyryl)-pyrrolidin-2-ylmethyl]-ethyl-carbamic acid tert-butyl ester

[(S)-1-((S)-2-Amino-3-methyl-butyryl)-piperidin-3-yl]-isopropyl-carbamic acid tert-butyl ester

[1-((S)-2-Amino-3-methyl-butyryl)-piperidin-3-yl]-cyclopropyl-carbamic acid tert-butyl ester

[1-((S)-2-Amino-3-methyl-butyryl)-piperidin-3-ylmethyl]-cyclopropyl-carbamic acid tert-butyl ester

[3-(tert-Butoxycarbonylamino-methyl)-pyrrolidin-1-yl]-acetic acid

[4-(tert-Butoxycarbonylamino-methyl)-piperidin-1-yl]-acetic acid