Ailanthone is an allelopathic chemical that is produced by the ''

Ailanthus altissima ''Ailanthus altissima'' , commonly known as tree of heaven, ailanthus, varnish tree, or in Chinese as ''chouchun'' (), is a deciduous tree in the family Simaroubaceae. It is native to northeast and central China, and Taiwan. Unlike other membe ...

'' tree which inhibits the growth of other plants.

References

{{Reflist Allelopathic substances Antimalarial agents Diterpenes Delta-lactones