【摘 要】
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Xanthenediones derivatives have attracted considerable interests in recent times because they constitute a structural unit in a number of natural products1 and
【机 构】
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SchoolofChemicalandEnvironmentalSciences,ChongqingUniversityofMedicalSciences
【基金项目】
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Supported by the National Natural Science Foundation of China (No. 20273019) and the Science Foundation of Henan Normal University for Young Scholars (No. 0307032).