A new Sequiterpenoid from Eupatorium adenophorum Spreng

A new sequiterpenoid compound 8a alpha-hydroxy-1-isopropyl-4,7-dimethyl-1,2,3,4,6,8a-hexahydro-naphthalene-2,6-dione (1), together with seven known compounds anti-HH-diiner-coumarin (2), (-)-5-exo-hydroxy-bomeol (3), O-hydroxyl cinnamic acid (4), 9,8-hydroxy-ageraphorone (5), 10H alpha-9-oxo-ageraphorone (6), 10H beta-9-oxo-ageraphorone (7) and 9-oxo-10, 11-dehydroageraphorone 8, was isolated from the leaves of Eupatorium adenophorum Spreng. The structures were elucidated by IR, (1)H and (13)C NMR, EIMS, HMBC and single-crystal X-ray spectral data.