Transformation products of furoeremophilanes and other constituents from Euryops arabicus

Abstract The aerial parts of Euryops arabicus afforded in addition to several known furoeremophilanes four new ones as well as four eremophilanolides, two seco derivatives and a rearranged spiro lactone. Furthermore two quercetin derivatives and an unusual diester of glucose were present. The structures were elucidated by high field NMR techniques and the biosynthesis of the unusual compounds is discussed.