(1R,4R)-[4-((S)-2-Amino-propionylamino)-cyclohexyl]-cyclopropyl-carbamic acid benzyl ester

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

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

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

(3-Benzyloxycarbonylamino-piperidin-1-yl)-acetic acid

{3-[(Benzyloxycarbonyl-methyl-amino)-methyl]-pyrrolidin-1-yl}-acetic acid

{2-[(Benzyloxycarbonyl-ethyl-amino)-methyl]-pyrrolidin-1-yl}-acetic acid

[4-(Benzyloxycarbonyl-ethyl-amino)-cyclohexylamino]-acetic acid

[4-(Benzyloxycarbonyl-isopropyl-amino)-piperidin-1-yl]-acetic acid

[(R)-3-(Benzyloxycarbonyl-cyclopropyl-amino)-pyrrolidin-1-yl]-acetic acid

{4-[(Benzyloxycarbonyl-cyclopropyl-amino)-methyl]-piperidin-1-yl}-acetic acid