4,4-diphenyl-1-(piperidin-4-yl)-imidazolidin-2-one 、
methanesulfonic acid 3-ethoxycarbonylamino-benzyl ester 以to yield {3-[4-(2-Oxo-4,4-diphenyl-imidazolidin-1-yl)-piperidin-1-ylmethyl]-phenyl}-carbamic acid ethyl ester的产率得到{3-[4-(2-oxo-4,4-diphenyl-imidazolidin-1-yl)-piperidin-1-ylmethyl]-phenyl}-carbamic acid ethylester