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The emergence of the H1N1 swine flu pandemic has the possibility to develop the occurrence of disaster- or drug-resistant viruses by additional reassortments in novel influenza A virus. In the course of an anti-influenza screening program for natural products, 10 xanthone derivatives (1–10) were isolated by bioassay-guided fractionation from the EtOAc-soluble extract of Polygala karensium. Compounds...
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