(4-tert-Butoxycarbonylamino-cyclohexylsulfanyl)-acetic acid

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

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

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

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

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

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

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

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

[(4-tert-Butoxycarbonylamino-cyclohexyl)-cyclopropyl-amino]-acetic acid

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