Oleanane
Oleanane is the name given to a chemical produced by many flowering plants, which has a suppressing effect on some insect threats.
It is considered a key marker differentiating flowering plants from other life, and in fact has been used in the effort to study their evolution which is as of yet poorly documented in the fossil record.
This chemical appears to have been shared by a group of plants called gigantopterids, which lived twice as long ago as the oldest known flower fossils. They may have been close relatives of the flowering plants, moving the divergence of the flowering plant lineage back to more than 250 million years ago. However oleanane is also recorded from ferns.
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External Links
Revised Section F: Natural Products and Related Compounds: Oleanane
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