CHEMICAL-COMPONENTS FROM CERATOSTIGMA-WILLMOTTIANUM

Investigation on the whole plant of Ceratostigma willmottianum for bio active compounds has led to the identification of 15 compounds. Two of them were characterized as new compounds, plumbolactones A 3-dihydrox yphenyl)dihydro-4-methyl-2(3H)-furanone, 1) and B dihydroxypropyl)-5-h ydroxy-1(3H)-isobenzofuranone, 2), while the other 13 were known compo unds, plumbagic acid (3), isoshinanolone, epiisoshinanolone, plumbagin (4), N-trans-caffeoyltyramine, N-trans-feruloyltyramine, myricetin, q uercetin, tricetin 3',5'-dimethyl ether, vanillic acid, syringic acid, caffeic acid, and 6,7-dihydroxycoumarin. The structures of the new co mpounds were assigned by 2D-NMR techniques.