1) Vinyl compound 
Cinchonine is an alkaloid found in Cinchona officinalis. It is used in asymmetric synthesis in organic chemistry. It is a stereoisomer and pseudo-enantiomer of cinchonidine. ...
• (n.) One of the quinine group of alkaloids isomeric with and resembling cinchonidine; -- called also cinchonia.
A quinoline alkaloid prepared from the bark of several species of Cinchona; a tonic and antimalarial agent. Several cinchonine salts are available. ... (05 Mar 2000) ... 
(sin´ko-nēn) an alkaloid of cinchona used as an antimalarial agent, chiefly in the form of the sulfate salt; administered orally.
Cin'cho·nine noun [ From Cinchona : confer French cinchonine .] (Chemistry) One of the quinine group of alkaloids isomeric with and resembling cinchonidine; -- called also cinchonia . 
Type: Term Pronunciation: sin′kō-nēn Definitions: 1. A quinoline alkaloid prepared from the bark of several species of Cinchona; a tonic and antimalarial agent. Several cinchonine salts are available.
Cinchonine is a vegetable alkaloid contained in all the varieties of Peruvian bark, but principally in Cinchona lancifolia, or pale-bark. Though less bitter than quinine, it may be substituted for it in larger quantities.
noun an alkaloid derivative of the bark of cinchona trees that is used as an antimalarial drug
a colorless, crystalline, slightly water-soluble alkaloid, CHNO, a stereoisomer of cinchonidine, obtained from the bark of various species of cinchona and used chiefly as a quinine substitute.