Sesquiterpene lactones are a class of natural products commonly found in plants of the Asteraceae family, which includes Montanoa tomentosa subsp. tomentosa. They are characterized by a 15-carbon skeleton and contain a lactone (a cyclic ester) ring. Sesquiterpene lactones often have various biological activities, such as anti-inflammatory, anti-fungal, and anti-cancer properties. These compounds are responsible for the bitter taste in many plants and may serve as a chemical defense mechanism against herbivores.
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