Cinchonine

Cinchonine, an alkaloid occurring with quinine and other closely related substances, in cinchona bark. Its chemical composition is represented by the formula C₁₉H₂₂N₂O, and its constitution has been the subject of much research and speculation, but is not yet established. It crystallises in monoclinic prisms, melting at about 250° C, and in its physiological action resembles quinine, but is less marked.