title: Constituents of cultivated mulberry tree.
abstract: From the ethyl acetate extract of the cultivated mulberry tree (Morus alba L.), two new flavonoid derivatives with a fused dihydrochalcone partial moiety were isolated, and named kuwanons K and L. The structures of kuwanons K and L were shown to be 1 and 2 respectively, on the basis of chemical and spectral data. Kuwanons K ( 1) and L ( 2) are regarded biogenetically as Diels-Alder adducts of a chalcone derivative and a dehydroprenylflavonoid derivative, and are the first example of a flavonoid derivative possessing a cyclohexene ring at a B ring of a flavonoid derivative.
authors.affiliation: Faculty of Pharmaceutical Sciences, Toho University, Funabashi, Chiba, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Nomura
authors.forename: T
authors.initials: T
authors.lastname: Fukai
authors.forename: Y
authors.initials: Y
authors.lastname: Hano
authors.forename: K
authors.initials: K
authors.lastname: Nemoto
authors.forename: S
authors.initials: S
authors.lastname: Terada
authors.forename: T
authors.initials: T
authors.lastname: Kuramochi