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

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

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

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

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

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

[(R)-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

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

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

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