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From the large genus Conyza (tribe Astereae, family Compositae) about 10% of the approximately 2000 species in this tribe have been subjected to chemical scruting. However, work has been confined largely to root constituents. Among these, polyacetylenes, polyenes and related substances and, in certain groups, coumarins are very characteristic. Less widely distributed, perhaps because they are less intensively searched for, are diterpenoids, so far largely of the labdane and clerodane type.
