Fern constituents: Eupha-7,24-diene and (20R)-dammara-13(17),24-diene, tetracyclic triterpenoid hydrocarbons isolated from Polypodium species.

Abstract

From the fresh leaves of polypodium someyae eupha-7, 24-diene and from the fresh rhizomes of P. fauriei (20R)-dammara-13 (17), 24-diene were obtained and characterized. These hydrocarbons are the first derivation from a natural source. They are rather unstable in the air.