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

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

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

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

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

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

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

[2-(tert-Butoxycarbonyl-isopropyl-amino)-cyclohexylamino]-acetic acid

[4-(tert-Butoxycarbonyl-isopropyl-amino)-cyclohexylamino]-acetic acid

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

[(S)-1-(2-Hydroxy-ethyl)-pyrrolidin-2-ylmethyl]-carbamic acid benzyl ester