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

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

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

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

(1R,4R)-{4-[((S)-2-Amino-propionyl)-methyl-amino]-cyclohexyl}-carbamic acid benzyl ester

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

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

(1R,4R)-{4-[((S)-2-Amino-propionyl)-ethyl-amino]-cyclohexyl}-carbamic acid benzyl ester

(R)-3-[((S)-2-Amino-propionyl)-isopropyl-amino]-piperidine-1-carboxylic 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

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