Biyoulactones A-C, new pentacyclic meroterpenoids from Hypericum chinense |
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Authors: | Tanaka Naonobu Abe Shuhei Hasegawa Kimiko Shiro Motoo Kobayashi Jun'ichi |
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Institution: | Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan. |
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Abstract: | Three novel pentacyclic meroterpenoids with a unique dilactone structure containing C-C bonded bi- and tricyclic γ-lactone moieties, biyoulactones A-C (1-3), were isolated from the roots of Hypericum chinense, and their structures were elucidated on the basis of spectroscopic data. The relative and absolute stereochemistry of 1 was assigned by a combination of NOESY and a single crystal X-ray diffraction analysis. |
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