[(R)-1-(2-Chloro-acetyl)-piperidin-3-yl]-cyclopropyl-carbamic acid tert-butyl ester

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

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

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

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

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

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

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

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

[2-((S)-2-Amino-propionylamino)-cyclohexyl]-isopropyl-carbamic acid tert-butyl ester

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