Antiviral benzofurans from Eupatorium chinense

Eleven benzofuran dimers including five pairs of enantiomers (e.g. compounds 2 and 3), and a benzofuran trimer were isolated from the roots of Eupatorium chinense. The absolute configurations of the enantiomeric benzofuran dimers were determined on the basis of circular dichroism experiments and quantum chemical CD calculation method. Euparin showed potential antiviral effect against RSV LONG and A2 strains.141