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

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

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

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

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

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

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

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

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

[4-(2-Chloro-acetylamino)-cyclohexyl]-carbamic acid tert-butyl ester

[2-(2-Chloro-acetylamino)-cyclohexyl]-carbamic acid tert-butyl ester