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

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

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

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

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

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

[4-(Benzyloxycarbonylamino-methyl)-piperidin-1-yl]-acetic acid

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

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

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

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