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.
Arai, Y., Hirohara, M., & Ageta, H. (1989). Fern constituents: Three new skeletal triterpenoid hydrocarbons isolated from Polypodiodes niponica. Tetrahedron Letters, 30(51), 7209–7212. https://doi.org/10.1016/S0040-4039(01)93936-X