methacholine
UK /mɛθ.əˈkəʊ.liːn/US /ˌmɛθ.əˈkoʊˌlin/
noun1
- A choline derivative with parasympathomimetic activity that can induce bronchoconstriction in asthmatics and is used in tests of airway responsiveness; O-acetyl-β-methylcholine, C₈H₁₈NO₂⁺.
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