Biflavones from the Leaves of Araucaria rulei F. Muell. and a Survey on Biflavanoids of the Araucaria Genus

Abstract

Eleven biflavones have been isolated from the leaves of Araucaria rulei and identified by NMR spectroscopy and via the permethylated and peracetylated products. The biflavones found until now in the Araucaria genus are summarized in a table.