4-[4-[(4-chlorophenyl)(2-pyridyl)methoxy]piperidine-1-yl]butyric acid ethyl ester 、
对甲苯磺酸 以to give 6.88 g (91%) of ethyl 4-[4-[(4-chlorophenyl)-2-pyridylmethoxy]-1-piperidyl]butanoate p-toluenesulfonate的产率得到ethyl 4-[4-[(4-chlorophenyl)-2-pyridylmethoxy]-1-piperidyl]butanoate p-toluenesulfonate