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Answer: quinidine
Answer	Crossword Clue
quinidine	a cinchona alkaloid, which is an optically active isomer of quinine and is used to treat cardiac arrhythmia
quinidine	colorless, crystalline alkaloid, C20H24N2O2, isomeric with quinine, obtained from the bark of certain species of cinchona trees or shrubs, used chiefly to regulate heart rhythm and to treat

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Answer: quinidine