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2Synthesis of Derivatives of Pyrazolo[3,4-d]pyrimidines by Reaction of 3,5-Bis(dimethylaminomethylene)amino-4-methoxycarbonylpyrazole and 4-Cyanopyrazole with Amines, Chemistry of Heterocyclic Compounds Synthesis of 3,4-diamino-1H-pyrazolo[3,4-d]pyrimidines, Chemistry of Heterocyclic Compounds