Three new triterpenoid hydrocarbons, named aonena-3,21-diene (1), podioda-7,17,21-triene (2) and podioda-8,17,21-triene (3), were isolated from fresh rhizomes of Polypodiodes niponica and their structures were established by spectral and chemical studies. Compound 1 is the first example of a final migrated product of dammarane series. Compounds 2 and 3 constitute a new migrated malabaricane series. © 1989.
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