(E)-2-[2-(2-ethoxy-3H-imidazo[4,5-b]pyridin-3-yl)methyl-10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-ylidene]propiononitrile 以60%的产率得到(E)-2-(2-ethoxy-3H-imidazo[4,5-b]pyridin-3-yl)methyl-5-[1-(1H-tetrazol-5-yl)ethylidene]-10,11-dihydro-5H-dibenzo[a,d]cycloheptene