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

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

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

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

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

[3-(Benzyloxycarbonylamino-methyl)-pyrrolidin-1-yl]-acetic acid

[(R)-3-(Benzyloxycarbonyl-methyl-amino)-piperidin-1-yl]-acetic acid

(1R,4R)-[4-(Benzyloxycarbonyl-methyl-amino)-cyclohexylamino]-acetic acid

[(S)-3-(Benzyloxycarbonyl-ethyl-amino)-piperidin-1-yl]-acetic acid

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

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