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[kwin-i-deen, -din] /ˈkwɪn ɪˌdin, -dɪn/

noun, Pharmacology.
a colorless, crystalline alkaloid, C 2 0 H 2 4 N 2 O 2 , isomeric with , obtained from the bark of certain species of cinchona trees or shrubs, used chiefly to regulate heart rhythm and to treat malaria.
a crystalline alkaloid drug that is an optically active diastereoisomer of quinine: used to treat heart arrhythmias. Formula: C20H24N2O2

quinidine quin·i·dine (kwĭn’ĭ-dēn’)
A colorless crystalline alkaloid that is a stereoisomer of quinine and is used as a treatment for malaria and cardiac arrhythmias.


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