Abstract
(±)-Heterocageflavone (1), a pair of enantiomeric isoprenylated flavonoids, were isolated from Artocarpus heterophyllus. Compound 1 incorporates an unusual tricyclo[5.3.1.03,8]undecane moiety, forming a unique caged polycyclic system. The structures of the pair were determined by spectroscopic analysis, ECD calculations, and single-crystal X-ray diffraction. Compound 1 showed significant inhibitory activity against LPS-induced NO production in RAW264.7 cells with an IC50 value of 49.2 μM.
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