Bitter principle from the bark of the Condurango vine, Marsdenia condurango Reichb. f., Asclepiadaceae, also known as eagle vine, mataperro, condor vine. Habit. Ecuador, Peru. Isoln: Korte, Korte, Z. Naturforsch. 10b, 223 (1955); Zechner, Z"olss, Sci. Pharm. 24, 107 (1956). Separation of fractions: Cellarius, Zechner, ibid. 34, 10 (1966). Proposed structure of the aglycone, condurangogenin A: Tschesche et al., Tetrahedron 21, 1777, 1797 (1965); 23, 1461 (1967).
Astringent.