Abstract
A novel family of three isoprenoidal hydrocarbons ( 1–3), a C 34H 64 and two C 33H 60, have been isolated from lacustrine sediment deposited 5,000–18,000 yrs BP ( 14C dating) and their structures and stereochemistry determined from the interpretation of 1D and 2D 1H and 13C NMR and mass spectral data as well as degradation by ozonolysis. These compounds are attributed to algae, based on their close structural relationship with botryococcenes and other isoprenoidal hydrocarbons produced by the green microalga Botryococcus braunii.
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