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

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

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

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

(1R,4R)-{4-[(2-Chloro-acetyl)-methyl-amino]-cyclohexyl}-carbamic acid tert-butyl ester

{4-[(2-Chloro-acetyl)-ethyl-amino]-cyclohexyl}-carbamic acid tert-butyl ester

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

{4-[(2-Chloro-acetyl)-isopropyl-amino]-cyclohexyl}-carbamic acid tert-butyl ester

{2-[(2-Chloro-acetyl)-cyclopropyl-amino]-cyclohexyl}-carbamic acid tert-butyl ester

(S)-2-[(2-Chloro-acetylamino)-methyl]-pyrrolidine-1-carboxylic acid benzyl ester

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