Abstract
From the Japanese foodstuff Akaboshi zenmai, consisting of dried leaves of Osmunda japonica Thunberg and from the Vermont royal fern Osmunda regalis var. spectabilis (Wilid.) Gray a new hydroxypentenolide glucoside, osmundalin ( 1), was isolated in addition to β-sitosterol and methyl and ethyl palmitate. The structure and absolute stereochemistry of osmundalin were established by spectroscopic and degradation methods and its aglycone, osmundalactone, was synthesized.
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