Components of Root Bark ofCudrania tricuspidata2. Structures of Two New Isoprenylated Flavones, Cudraflavones A and B.

Abstract
Two new isoprenylated flavones, cudraflavones A and B were isolated from the root bark of Cudrania tricuspidata (Carr.) Bur. (Japanese name “Hariguwa”, Moraceae). The structures of cudraflavones A and B were shown to be 1 and 2, respectively, on the basis of spectral data. Photo-oxidative cyclization occurred with cudraflavone B leading to the formation of a hydroperoxide possessing a dihydrooxepin ring.

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