(S)-3-[(2-Chloro-acetyl)-isopropyl-amino]-piperidine-1-carboxylic acid benzyl ester

(S)-3-[(2-Amino-acetyl)-ethyl-amino]-piperidine-1-carboxylic acid benzyl ester

(R)-3-[(2-Amino-acetyl)-isopropyl-amino]-pyrrolidine-1-carboxylic acid benzyl ester

4-{[(2-Amino-acetyl)-ethyl-amino]-methyl}-piperidine-1-carboxylic acid benzyl ester

2-{[(2-Amino-acetyl)-isopropyl-amino]-methyl}-piperidine-1-carboxylic acid benzyl ester

3-[(2-Amino-acetyl)-cyclopropyl-amino]-piperidine-1-carboxylic acid benzyl ester

4-{[(2-Amino-acetyl)-cyclopropyl-amino]-methyl}-piperidine-1-carboxylic acid benzyl ester

(S)-3-((S)-2-Amino-propionylamino)-piperidine-1-carboxylic acid benzyl ester

(R)-3-((S)-2-Amino-propionylamino)-piperidine-1-carboxylic acid benzyl ester

(R)-3-[((S)-2-氨基-丙酰基)-甲基-氨基]-哌啶-1-甲酸苄酯, (R)-3-[((S)-2-Amino-propionyl)-methyl-amino]-piperidine-1-carboxylic acid benzyl ester

{4-[((S)-2-Amino-propionyl)-methyl-amino]-cyclohexyl}-carbamic acid benzyl ester