2-(2-Hydroxy-ethylsulfanylmethyl)-piperidine-1-carboxylic acid benzyl ester

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

2-(((1R,4R)-4-((tert-butoxycarbonyl)amino)cyclohexyl)-(cyclopropyl)amino)acetic acid

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

(R)-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

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

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

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

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

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