XANTHONES FROM POLYGALA-NYIKENSIS

The dichloromethane extract from the roots of Polygala nyikensis affor ded four simple xanthones, two of which are new compounds. Their struc tures were established by chemical and spectroscopic methods (UV, EIMS , H-1 and C-13 NMR, NOE difference spectroscopy). 1,7-Dihydroxy-4-meth oxyxanthone and 1,7-dihydroxy-3,5,6-trimethoxyxanthone exhibit antifun gal activity against the plant pathogenic fungus Cladosporium cucumeri num.