The constituents of Olearia heterocarpa. The structure of olearin, a diterpene dilactone of the cascarillin group

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Abstract
Chloroform extraction of Olearia heterocarpa S. T. Blake has yielded a new diterpene dilactone, olearin, the known flavone, xanthomicrol, an unknown C27H42O3 hydroxy acid, and a mixture of long-chain (approx. C50) esters. On chemical and spectroscopic evidence olearin (1) has been shown to possess a rearranged enantio-labdane skeleton of the type displayed by the cascarillins. Correlation of olearin with a diterpene of known stereochemistry has defined the absolute con- figuration at all but one centre.

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