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New method for the synthesis of thieno[2,3-d]pyrimidines

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Novel Method for Synthesis of Pyrido[4,3-d]pyrimidines

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Condensed Pyridopyrimidines. 6. Synthesis of Novel Pyrano[3',4':6,7]pyrido[2,3-d]pyrimidines

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Derivatives of Condensed Thienopyrimidines. 22. Synthesis of 2-Substituted 4-Thioxopyrano[4′,3′:4,5]thieno[2,3-d]pyrimidines

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