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

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

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

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

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

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

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

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

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

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