His doctoral thesis in 1775 examined medical use of quassin from the plant quassia amara.
2.
"' Quassin "'is a white bitter, crystalline substance that is the prototypical example of the family of quassinoids.
3.
Although its skeleton possesses 20 carbon atoms, quassin is not a diterpene but rather a triterpene lactone, which derives from euphol by loss of 10 carbon atoms including C4.
4.
Asian and European chemists have found some justification for its medical use as it contains a long list of active chemicals that include quassin and saponin, while ailanthone, the allelopathic chemical in the tree of heaven, is a known antimalarial agent.
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