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Spiroinonotsuoxotriols A ( 1 ) and B ( 2 ), two highly rearranged pentacyclic triterpenoids featuring a novel 7(8 → 9)abeo-21,24-cyclo-lanostane skeleton, together with their proposed precursors 3 – 5, were isolated from the sclerotia of the white-rot fungus Inonotus obliquus . Their structures including the absolute configurations were elucidated by extensive spectroscopic analyses and single-crystal X-ray diffraction. The biogenetic pathway of 1 and 2 was proposed. Compounds 1 and 2 exhibited potent α-glucosidase inhibitory activity as compared with the positive control acarbose.
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Ying et al. (2020) studied this question.
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