Phytochemistry p. 967 - 970 (1992)
Update date:2022-08-30
Topics:
Lee, Min-Won
Tanaka, Takashi
Nonaka, Gen-Ichiro
Nishioka, Itsuo
A novel ellagtannin, hirsunin, was isolated from the leaves of Alnus hirsuta var. microphylla and the structure which consist of diarylheptanoid glycoside (oregonin) and ellagtannin (praecoxin A) moieties connected through an ester linkage has been elucidated.Furthermore, the occurrence of the seven known hydrolysable tannins, pedunculagin, praecoxin A, 1,2,6- and 1,4,6-tri-O-galloyl-β-D-glucoses, 1-desgalloyleugeniin, 1-desgalloylrugosin F, and rugosin F, along with oregonin and gentisic acid 5-O-β-D-(6'-O-galloyl)-glucopyranoside has also been demonstrated. Key words: Alnus hirsuta var. microphylla; Betulaceae; hydrolysable tannin; ellagtannin; hirsunin; praecoxin A; diarylheptanoid; oregonin.
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