Extractives from guttiferae. Part 34. Kolaflavanone, a new biflavanone from the nuts of Garcinia kola Heckel. Applications of 13C nuclear magnetic resonance in elucidation of the structures of flavonoids

Abstract
The nuts of Garcinia kola Heckel contain 3,8-linked biflavanones and triterpenes. A new metabolite, kolaflavanone, has been characterised as the II-4′-methyl ether of GB-2, as part of a 13C n.m.r. study of flavonoids.