(S)-2-(2-Hydroxy-ethylsulfanylmethyl)-pyrrolidine-1-carboxylic acid tert-butyl ester

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

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

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

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

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

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

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

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

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

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