SEARCH Articles Figures Tables 4- pyrimido Purines pyrimido pyrimidines Pyrimido pyrimidin-2,5-diones Pyrimido pyrimidin-2-ones Pyrimido pyrimidine-2,4,7-triones Pyrimido pyrimidine-2,4-diones Pyrimido pyrimidine-2,4-diones synthesis Pyrimido pyrimidine-6-carboxylates Pyrimido pyrimidine-6-carboxylates 5-hydroxy Pyrimido pyrimidines, methylation