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

(S)-3-(Carboxymethyl-amino)-pyrrolidine-1-carboxylic acid tert-butyl ester

(1R,4R)-(4-tert-Butoxycarbonylamino-cyclohexylamino)-acetic acid

3-(Carboxymethyl-ethyl-amino)-pyrrolidine-1-carboxylic acid tert-butyl ester

(R)-3-(Carboxymethyl-methyl-amino)-piperidine-1-carboxylic acid tert-butyl ester

(R)-3-(Carboxymethyl-ethyl-amino)-piperidine-1-carboxylic acid tert-butyl ester

3-[(Carboxymethyl-ethyl-amino)-methyl]-piperidine-1-carboxylic acid tert-butyl ester

[(2-tert-Butoxycarbonylamino-cyclohexyl)-isopropyl-amino]-acetic acid

3-[(Carboxymethyl-isopropyl-amino)-methyl]-piperidine-1-carboxylic acid tert-butyl ester

3-(Carboxymethyl-cyclopropyl-amino)-pyrrolidine-1-carboxylic acid tert-butyl ester

(R)-3-(Carboxymethyl-cyclopropyl-amino)-piperidine-1-carboxylic acid tert-butyl ester

(S)-3-(2-Chloro-acetylamino)-pyrrolidine-1-carboxylic acid tert-butyl ester

(S)-3-(2-Chloro-acetylamino)-piperidine-1-carboxylic acid tert-butyl ester

2-{[(2-Chloro-acetyl)-methyl-amino]-methyl}-pyrrolidine-1-carboxylic acid tert-butyl ester

(S)-3-[(2-Chloro-acetyl)-methyl-amino]-pyrrolidine-1-carboxylic acid tert-butyl ester