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

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

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

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

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

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

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

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

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

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

[3-(苄氧基羰基-乙基-氨基)-吡咯烷-1-基]-乙酸, [3-(Benzyloxycarbonyl-ethyl-amino)-pyrrolidin-1-yl]-acetic acid