The Collaborative International Dictionary of English v.0.48:

Cinchonine \Cin"cho*nine\, n. [From Cinchona: cf. F.
   cinchonine.] (Chem.)
   One of the quinine group of alkaloids isomeric with and
   resembling cinchonidine; -- called also cinchonia.
   [1913 Webster]

WordNet (r) 3.0 (2006):

cinchonine
    n 1: an alkaloid derivative of the bark of cinchona trees that
         is used as an antimalarial drug