4-[(2-Amino-acetylamino)-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

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

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

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

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

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

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