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

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

3-{[((S)-2-Amino-propionyl)-methyl-amino]-methyl}-piperidine-1-carboxylic acid benzyl ester

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

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

(S)-3-[((S)-2-氨基-丙酰基)-异丙基氨基]-哌啶-1-甲酸苄基酯, (S)-3-[((S)-2-Amino-propionyl)-isopropyl-amino]-piperidine-1-carboxylic acid benzyl ester

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

2-[((S)-2-Amino-3-methyl-butyrylamino)-methyl]-pyrrolidine-1-carboxylic acid benzyl ester

4-((S)-2-Amino-3-methyl-butyrylamino)-piperidine-1-carboxylic acid benzyl ester

4-{[((S)-2-Amino-3-methyl-butyryl)-methyl-amino]-methyl}-piperidine-1-carboxylic acid benzyl ester