Abstract
The roots of Thapsia villosa afforded in addition to other terpenoids, a sesquiterpene, with a new carbon skeleton. The structure, including the relative configuration, was elucidated by spectroscopic methods, a few chemical transformations and by X-ray analysis. The absolute configuration was determined by means of the method of Horeau. The trivial name thapsan is suggested for the parent structure [2a R,2b R,6a S,7a S]-2b,3,3,6a-tetramethylperhydroindeno[2,3-c]-furan.
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