a-Santonin, isolated from the flower heads of certain species of Artemisia, is an anthelmintic (meaning against intestinal worms). This terpene is used in oral doses of 60 mg to rid the body of roundworms such as Ascaris lumbricoides. It has been es- timated that over one-third of the world's population is infested with these slender, threadlike parasites. CH3 CH3 a-Santonin CH3

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