(1R,4R)-[4-((S)-2-Amino-3-methyl-butyrylamino)-cyclohexyl]-ethyl-carbamic acid benzyl ester

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

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

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

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

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

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

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

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

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

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

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

2-[(R)-3-(Benzyl-methyl-amino)-piperidin-1-yl]-ethanol

2-{2-[(Benzyl-methyl-amino)-methyl]-piperidin-1-yl}-ethanol

2-{3-[(Benzyl-ethyl-amino)-methyl]-pyrrolidin-1-yl}-ethanol