Chemical Constituents from the Flowers of Eupatorium adenophorum

A new sesquiterpenene lactone-eupatoranolide was isolated from the flowers of Eupatorium adenophorum. Some known comporumds, 2-acetoxy-3, 4, 6, 11-tetradehydrocadinan-7-one, 7-oxoagera phorone, kolavenol, eugenyl-O-β-D-glucopyranoside, 5,4′-dihydroxy-3,6-dimethoxy-7-O-β-D-glucopyranoxyflavonone, 5, 4′-dihydroxy-6,7-dimethoxy-3-O-β-D-glucopyranoxyflavonone, 3, 5, 4′-trihydroxy-6, 7-dimethoxyflavonone were also obtained. Their structures were determined by spectroscopic evidence.