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methylsalicylate (meˈ·thl·s·liˑ·s·lāt),

n a liquid ester with the chemical formula C8H8O3 that is derived from the bark of a birch,
Betula lenta or the leaves of wintergreen,
Gaultheria procumbens; used as an antiinflammatory, counterirritant, or flavoring agent and to treat pharyngitis, chorea, lumbago, orchitis, mumps, neuralgia, and rheumatism—chronic and acute; precautions: highly toxic. In children a directly ingested dose of less than one teaspoon has been lethal. In rare cases, it has also been linked with allergic skin reactions.