Most species have strong aromas and bitter tastes from terpenoids and sesquiterpene lactones, which discourage herbivory, and may have had a selective advantage.
32.
"' Lactucin "'is a bitter substance that forms a white crystalline solid and belongs to the group of sesquiterpene lactones.
33.
However, it is a non-isoprenoid sesquiterpene, meaning that unlike most sesquiterpenes its structure is not based on a repeated isoprene unit.
34.
In addition, one sesquiterpene has also been isolated and the derivative of the ketone form has been commercially produced in Japan to treat cough.
35.
They are also commonly featured in medical and phytochemical journals because the sesquiterpene lactone compounds contained within them are an important cause of allergic contact dermatitis.
36.
Other ingredients are aesculetin, aesculin, cichoriin, umbelliferone, scopoletin, 6, 7-dihydrocoumarin, and further sesquiterpene lactones and their glycosides.
37.
"' ?-Vetivone "'is an organic compound that is classified as a sesquiterpene ( derived from three isoprene units ).
38.
Lettuce contains several defensive compounds, including sesquiterpene lactones, and other natural phenolics such as flavonol and glycosides, which help to protect it against pests.
39.
For this reason, botrydial, as well as other Botrytis Cinerea originated sesquiterpene metabolites, represent an economically important disease for ornamental and agriculturally important crops.
40.
This sesquiterpene alcohol is thought to be formed in carrot seeds ( " Daucus carota L ., Umbelliferae " ) during the vegetation period.
