4,6-Diacetylresorcinol in Heterocyclic Synthesis, Part I: Synthesis and Biological Evaluation of Some New Linearly and Angularly Substituted Pyrano[3,2-g] Chromenes via Vilsmeier–Haack Formylation of 4,6-Diacetylresorcinol, Its Schiff Bases, and Hydrazones

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