Ent-Norlabdanes And Other Constituents Of 4 Venezuelan Species Previously Classified In The Genus Eupatorium

Abstract

The investigation of four Venezuelan species previously classified in the genus Eupatorium, but which are now placed in the genera Chromolaena, Lourteigia, Ageratina, and Austroeupatorium, led to the isolation of several known flavonoids, diterpenes, and a chromene derivative. Austroeupatol [3], a novel ent-norlabdane, was obtained from Austroeupatorium inulaefolium. Its structure was established by spectroscopic methods.