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

((R)-3-tert-Butoxycarbonylamino-pyrrolidin-1-yl)-acetic acid

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

((S)-3-tert-Butoxycarbonylamino-piperidin-1-yl)-acetic acid

{2-[(tert-Butoxycarbonyl-methyl-amino)-methyl]-piperidin-1-yl}-acetic acid

[(R)-3-(tert-Butoxycarbonyl-ethyl-amino)-pyrrolidin-1-yl]-acetic acid

[(S)-3-(tert-Butoxycarbonyl-ethyl-amino)-piperidin-1-yl]-acetic acid

[(S)-3-(tert-Butoxycarbonyl-isopropyl-amino)-pyrrolidin-1-yl]-acetic acid

{2-[(tert-Butoxycarbonyl-isopropyl-amino)-methyl]-pyrrolidin-1-yl}-acetic acid

{3-[(tert-Butoxycarbonyl-isopropyl-amino)-methyl]-piperidin-1-yl}-acetic acid

[(R)-3-(tert-Butoxycarbonyl-cyclopropyl-amino)-piperidin-1-yl]-acetic acid