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A new dimeric naphthoquinone, named 5,8,5′-trihydroxy-8′-methoxy-6,6′-dimethyl-7,3-binaphthyl-1,4,1′,4′-tetraone (1), was isolated from Diospyros lotus stem. The structure of the compound was elucidated by advance spectroscopic analysis including 1D and 2D experiments such as HMBC, NOESY, and J-resolved (JRES). Compound1was assessed for antioxidant activity, which showed good activity even at low concentration.
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