N-cyano-iminodiphenylcarbonate 、 1-[3,5-dibromo-4-methyl-D,L-phenylalanyl]-4-(1-piperidinyl)piperidine 、
3-(哌啶-4-基)-3,4-二氢喹唑啉-2(1H)-酮 以34%的产率得到1-[3,5-dibromo-N-[[4-(3,4-dihydro-2(1H)-oxoquinazolin-3-yl)-1-piperidinyl]cyanoiminomethyl]-4-methyl-D,L-phenylalanyl]-4-(1-piperidinyl)-piperidine