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An efficient and novel two step synthetic procedure to prepare various substituted 3H,3′H-spiro[benzofuran-2,1′-isobenzofuran]-3,3′-diones A, was established from very simple and easily available starting materials. The developed method is a robust and general approach for the synthesis of these structures. The prepared compounds were tested against influenza virus type A viz., A/Taiwan/1/86 (H1N1),...
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