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[摘要]：Fourteen sesquiterpenoids with an eudesmane C-atom skeleton, including four new ones, (1 beta,5 alpha,7 beta,8 beta,11 beta)-5-hydroperoxy-1-hydroxyeudesm-4(15)-eno-12,8-lactone (1), (1 beta,5 beta,7 beta,8 beta)-8-(acetyloxy)-5-hydroperoxy-1-hydroxycostic acid methyl ester (12), and a mixture of (1 beta,3 beta,4 beta,7 beta,8 beta)-1,3-dihydroxyeudesma-5,11(13)-dieno-12,8-lactone (7) and (1 beta,3 beta,4 beta,7 beta,8 beta,11 beta)-1,3-dihydroxyeudesm-5-eno-12,8-lactone (8), were isolated from the aerial parts of Inula japonica (Asteraceae). Their structures were determined by extensive spectroscopic methods, and those of 7 and 12 confirmed by means of single-crystal X-ray diffraction analysis. |
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