SEARCH Articles Figures Tables 2,6-Purine-dione synthesis 2,6-purine-dione 8-methyl 7-Alkyl purine-2,4- -diones 8-Bromo-7- purine-2,6-dione Imidazo purine 2,4-dione Imidazo(2,l-/]purine-2,4-diones L//-Purine-2,6-diones Purine-2,6-dione Pyrido purine-2,4-dione