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

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

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

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

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

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

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

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

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

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

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