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Synthesis and Regioselective N- And O-Alkylation of 3-Alkyl-5-Phenyl-3h-[1,2,3]triazolo[4,5-D]pyrimidin-7(6h)-Ones and 2-Phenyl-9-Propyl-9h-Purin-6(1h)-One With Evaluation of Antiviral and Antitumor Activities