title: Cowaniin, a C-glucosidic ellagitannin dimer linked through catechin from Cowania mexicana.
abstract: A new complex tannin, cowaniin (1) was isolated from the leaves and stems of Cowania mexicana (Rosaceae), and its structure was characterized as novel C-glucosidic tannin dimer linked through (+)-catechin on the basis of spectral and chemical evidence. The inhibitory effect on activation of the Epstein-Barr virus early antigen was assessed for cowaniin. Six known polyphenols and related compounds, including a nitrile glucoside, purshianin, were also characterized.
authors.affiliation: Department of Pharmacognosy, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Tsushima, Okayama, Japan. hito@cc.okayama-u.ac.jp
authors.forename: Hideyuki
authors.initials: H
authors.lastname: Ito
authors.forename: Masateru
authors.initials: M
authors.lastname: Miyake
authors.forename: Eisei
authors.initials: E
authors.lastname: Nishitani
authors.forename: Kyoko
authors.initials: K
authors.lastname: Miyashita
authors.forename: Morio
authors.initials: M
authors.lastname: Yoshimura
authors.forename: Takashi
authors.initials: T
authors.lastname: Yoshida
authors.forename: Midori
authors.initials: M
authors.lastname: Takasaki
authors.forename: Takao
authors.initials: T
authors.lastname: Konoshima
authors.forename: Mutsuo
authors.initials: M
authors.lastname: Kozuka
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Hatano
mesh_terms: D002392:Catechin / Q000737:chemistry*; D015394:Molecular Structure; D035261:Plant Components, Aerial / Q000737:chemistry; D027824:Rosaceae / Q000737:chemistry*; D013634:Tannins / Q000737:chemistry*
chemical_list: D013634:Tannins; C520700:cowaniin; D002392:Catechin