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]pentadecane-bridged system. Compounds 3 and 4 featured an unprecedented 5-5-5-5-fused core skeleton, while 3 also contained an unexpected C-3-C-14 oxygen bridge to construct the caged architecture. Compounds 5-7 form a new class of highly modified pentacyclic oxaspiro[4.4]nonane-containing sesterterpene-alkaloid hybrids. Their biosynthetic pathways and potential HMG-CoA reductase inhibitory and antimicrobial activities are also discussed.
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Liu et al. (2019) studied this question.
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