双表白术内酯的结构鉴定

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白术(Artactylodes macrocephala Koidz)为有多种生物活性的传统常用中药.从中分得4个已知化合物,另外一个物质的MS,1D和2D NMR表明是类型较为罕见的完全对称的双倍半萜新化合物,命名为双表白术内酯(biepiasterolid).
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