Any of a group of triterpenehydrocarbons, such as (4aS,8aS,4a'S,8a'S)-8,8'-(1,2-ethanediyl)bis(4,4,7,8a-tetramethyl-1,2,3,4,4a,5,6,8a-octahydronaphthalene), found in the fern Lemmaphyllum microphyllum (species)
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