Oleananes is the name given to chemicals produced by many flowering plants, which have a suppressing effect on some insect pest organisms. Technically they're oleanane triterpanes. They are considered a key marker differentiating flowering plants from other life, and have been used in the effort to study their evolution which is as of yet poorly documented in the fossil record. These compounds appear to have been shared by a group of plants called gigantopterids, which lived twice as long ago as… (More on Oleanane)