for the following products
1,2,3,4-Tetrahydro-6,6-dimethoxyquinazoline-2,4-dione | 2,4-Dihydroxy-6,7-dimethoxyquinazoline | 6,7-Dimethoxy-(1H,3H)-2,4-quinazolindione | 6,7-Dimethoxy-2,4-quinazolinedione | 6,7-Dimethoxyquinazoline-2,4-dione and 6,7-Dimethoxy-2,4(1H,3H)-quinazolinedione
