SEARCH Articles Figures Tables 1,2,4-Triazolopyrimidines l,2,4-triazolo pyrimidines Hermecz, I., Vasvari-Debreczy, L., Tricyclic Compounds with a Central Pyrimidine Hermecz, I., Vasvari-Debreczy, L., Tricyclic Compounds with a Central Pyrimidine Ring Pyrido l ,2-a)pyrimidines, chemistry