[(S)-1-(2-Amino-ethyl)-pyrrolidin-3-yl]-cyclopropyl-carbamic acid benzyl ester

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

4-((S)-2-Amino-propionylamino)-piperidine-1-carboxylic acid tert-butylester

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

3-[((S)-2-Amino-propionyl)-methyl-amino]-piperidine-1-carboxylic acid tert-butyl ester

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

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

3-[((S)-2-Amino-propionyl)-isopropyl-amino]-pyrrolidine-1-carboxylic acid tert-butyl ester

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

3-[((S)-2-Amino-propionyl)-isopropyl-amino]-piperidine-1-carboxylic acid tert-butyl ester

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