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

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

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

((S)-3-Benzyloxycarbonylamino-pyrrolidin-1-yl)-acetic acid

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

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

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

{2-[(Benzyloxycarbonyl-isopropyl-amino)-methyl]-piperidin-1-yl}-acetic acid

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

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

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