Propanedioic acid, ethyl-, monoethyl ester 、
3,5-二氯苯胺 、
N,N'-二环己基碳二亚胺 以to give 0.87 gram (0.003 mole) of ethyl 2-(3,5-dichlorophenylaminocarbonyl)butanoate having a melting point of 96.5° C.-98° C.的产率得到ethyl 2-[(3,5-dichlorophenyl)carbamoyl]butanoate