SEARCH Articles Figures Tables 2- Aryl-4/7-pyrido pyrimidin-4-ones 2-Aryl-1,2,4-triazolo pyrimidines preparation 4- Aryl-2-imino-6,7,8,9-tetrahydro-2//pyrido pyrimidines 4-Aryl-2,3-dihydro-1 //-pyrido pyrimidine-1,3-diones 5- Aryl-1,2,4-triazolo pyrimidines Pyrido pyrimidine-2,4-diones, 6-aryl Pyrimidine-2 -thiones, 1-aryl