Kuwanon G, a new flavone derivative from the root barks of the cultivated mulberry tree (Morus alba L.).

A new flavone derivative, containing condensed dihydrochalcone partial structure named kuwanon G, was isolated from the root barks of the cultivated mulberry tree (a variety of Morus alba L.). The structure was shown to be 1 on the basis of chemical and spectral data. The compound (1) to rabbit (1 mg/kg, i.v.) produced a significant hypotension.