cinchonidine

noun
cin·cho·ni·dine | \-ˈkän-ə-ˌdēn, -ˈkō-nə-, -ˈchō-nə-\

Medical Definition of cinchonidine 

: a bitter crystalline alkaloid C19H22N2O stereoisomeric with cinchonine that is found in cinchona bark and used like quinine

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