4-(5-chloro-2-oxo-2,3-dihydro-benzoimidazol-1-yl)-piperidine-1-carboxylic acid ethyl ester
2,5-dichloronitrobenzene
4-(4-chloro-2-nitro-anilino)-piperidine-1-carboxylic acid ethyl ester
ethyl 4-[(2-amino-4-chlorophenyl)amino]piperidine-1-carboxylate
ethyl 4-aminopiperidine-1-carboxylate