The present study to evaluate the potential of constituents of the bark of Alnus japonica as a functional food with medicinal properties led to the identification of one new diarylheptanoid, named alusenone (1A), and 11 known ones (1B and 2-11). Their antioxidative and hepatoprotective activities were accessed by, respectively, a TOSC assay and a TBH-induced hepatotoxicity rat model. Mixtures 1, 2-6, 10, and 11 showed good antioxidative and hepatoprotective effects as compared with the positive controls.
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