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

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

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

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

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

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

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

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

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

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

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