Cowaniin, a C-glucosidic ellagitannin dimer linked through catechin from Cowania mexicana.
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.
Ito
Hideyuki
H
Department of Pharmacognosy, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Tsushima, Okayama, Japan. hito@cc.okayama-u.ac.jp
Miyake
Masateru
M
Nishitani
Eisei
E
Miyashita
Kyoko
K
Yoshimura
Morio
M
Yoshida
Takashi
T
Takasaki
Midori
M
Konoshima
Takao
T
Kozuka
Mutsuo
M
Hatano
Tsutomu
T
D002392:Catechin / Q000737:chemistry*; D015394:Molecular Structure; D035261:Plant Components, Aerial / Q000737:chemistry; D027824:Rosaceae / Q000737:chemistry*; D013634:Tannins / Q000737:chemistry*
D013634:Tannins; C520700:cowaniin; D002392:Catechin