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

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

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

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

[2-((S)-2-Amino-3-methyl-butyrylamino)-cyclohexyl]-isopropyl-carbamic acid tert-butyl ester

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

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

[2-((S)-2-Amino-3-methyl-butyrylamino)-cyclohexyl]-cyclopropyl-carbamic acid tert-butyl ester

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

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

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