3-(2-Hydroxy-ethylsulfanyl)-piperidine-1-carboxylic acid tert-butyl ester

[4-(2-Amino-ethylsulfanyl)-cyclohexyl]-carbamic acid tert-butyl ester

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

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

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

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

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

(1R,4R)-[(4-tert-Butoxycarbonylamino-cyclohexyl)-isopropyl-amino]-acetic acid

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

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

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