6,8-diamino-7-cyano-5-(p-methoxyphenyl)-1,2,3,4,5,10-hexahydropyrimido[4,5-b][1,8]naphthyridine-2,4-dione 、 formamide 反应 6.0h,
以44%的产率得到11,13-Diamino-9-(4-methoxyphenyl)-2,4,6,14,16,18-hexazatetracyclo[8.8.0.03,8.012,17]octadeca-1(18),3(8),10,12,14,16-hexaene-5,7-dione