title: Dimeric flavonol glycoside and galloylated C-glucosylchromones from Kunzea ambigua.
abstract: A novel dimeric flavonol glycoside linked through a methylene group, kunzeagin A (1), and six new chromone C-glucosides, kunzeachromones A-F (2-7), were isolated along with seven known compounds from the leaf extract of Kunzea ambigua. The structures of these compounds were elucidated on the basis of spectroscopic analyses and chemical properties. Kunzeachromones A-F provided additional examples of galloylated C-glucosidic chromones occurring in the Myrtaceae. Kunzeagin A (1) and major constituents of this plant (6-C- and 8-C-glucosylchromones and their monogallates) exhibited potent inhibitory effects on activation of Epstein-Barr virus early antigen induced by 12-O-tetradecanoylphorbol 13-acetate in Raji cells.
authors.affiliation: Faculty of Pharmaceutical Sciences, Okayama University, Tsushima, Okayama 700-8530, Japan.
authors.forename: Hideyuki
authors.initials: H
authors.lastname: Ito
authors.forename: Naoki
authors.initials: N
authors.lastname: Kasajima
authors.forename: Harukuni
authors.initials: H
authors.lastname: Tokuda
authors.forename: Hoyoku
authors.initials: H
authors.lastname: Nishino
authors.forename: Takashi
authors.initials: T
authors.lastname: Yoshida
mesh_terms: D000956:Antigens, Viral / Q000187:drug effects; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D006027:Glycosides / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D004854:Herpesvirus 4, Human / Q000502:physiology; D006801:Humans; D007564:Japan; D031648:Kunzea / Q000737:chemistry*; D015394:Molecular Structure; D018515:Plant Leaves / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D013237:Stereoisomerism; D013329:Structure-Activity Relationship; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D014407:Tumor Cells, Cultured; D014775:Virus Activation
chemical_list: D000956:Antigens, Viral; C033305:Epstein-Barr virus early antigen; D005419:Flavonoids; D006027:Glycosides; C484825:kunzeagin A; D013755:Tetradecanoylphorbol Acetate