An Arylbenzofuran, Stilbene Dimers, and Prenylated Diels-Alder Adducts as Potent Diabetic Inhibitors from Leaves.

has a long history of usage as a treatment for metabolic diseases, especially, diabetes mellitus (DM). Thus, we aimed to isolate and evaluate bioactive constituents derived from leaves for the treatment of DM. According to bioassay-guided isolation by column chromatography, eight compounds were obtained from leaves: two phenolic compounds, -coumaric acid () and chlorogenic acid methyl ester (), one stilbene, oxyresveratrol (), two stilbene dimers, macrourin B () and austrafuran C (), one 2-arylbenzofuran, moracin M (), and two Diels-Alder type adducts, mulberrofuran F () and chalcomoracin ().