2,4,4-trimethyl-1,2,3,4-tetrahydroisoquinolin-7-amine 、
7-chloro-3-(2,6-dichlorophenyl)-4-imino-1-methyl-3,4-dihydropyrimido[4,5-d]pyrimidin-2(1H)-one 、 4-amino-7-chloro-3-(2,6-dichlorophenyl)pyrimido[4,5-d]pyrimidin-2-one 以obtained in Production Example 7的产率得到3-(2,6-dichlorophenyl)-7-(3',4'-dihydro-2'H-spiro[cyclobutane-1,1'-isoquinolin]-6'-ylamino)-4-imino-1-methyl-3,4-dihydropyrimido[4,5-d]pyrimidin-2(1H)-one