(7E)-9-Benzyl-7-[(dimethylamino)methylene]-6-hydroxy-1,3-dimethyl -6,7-dihydropyrimido[2,1-f]purine-2,4,8(1H,3H,9H)-trione 在
sodium hydroxide 作用下,
以89%的产率得到9-benzyl-1,3-dimethyl-7-formyl-6-hydroxypyrimido<2,1-f>purine-2,48(1H,3H,9H)-trione sodium salt