It is chiefly obtained from Cinchona pitayensis.

Characters. - White silky needles, no smell, very bitter taste, with a neutral or faintly alkaline reaction.

Solubility and Reactions. - It is soluble in 100 parts of water at 59° F. For its reactions, vide p. 941.

U.S.P. Cinchonina. Cinchonine. C20H24N2O; 308.

Characters. - White, somewhat lustrous, prisms or needles, no smell, at first nearly tasteless, but developing a bitter after-taste and having an alkaline reaction.

Solubility. - Almost insoluble in hot or cold water, readily soluble in diluted acids.