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Clavicorolides A (1) and B (2), two sesquiterpenoids possessing a novel backbone named as Clavicoronane-type, together with one new and two known Protoilludane-type sesquiterpenoids, namely, Tsugicolines M (3), A (4), and C (5), and Sterpurane (6), and Lactarane-type sesquiterpenoid Lactarorufin A (7), were isolated from the fermentation products of Clavicorona pyxidata YB2005. Their structures including relative and absolute configurations were elucidated on the basis of NMR data and analysis of X-ray single crystal diffraction.
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Zheng et al. (2008) studied this question.
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