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an alkaloid of the tropane group commonly occurring in such solanaceous plants as belladonna, henbane, and datura (mainly in the leaves). The alkaloid is also present in the rhizome of Scopolia. Scopolamine is similar to atropine in chemical properties and physiological activity. Its hydrobro-mide is used in anesthesiology; it is also an antiparkinson and cholinolytic agent. A derivative of scopolamine and camphor is included in the composition of aeron, an antiemetic.