Stilbene Derivatives from Cissus quadrangularis

Three new stilbene derivatives, quadrangularins A, B, and C ( 2 − 4 ), have been isolated from the stems of Cissus quadrangularis, together with four known ones: resveratrol, piceatannol, pallidol ( 1 ), and parthenocissine A ( 5 ). Structure elucidation of the new compounds was achieved using 2D NMR experiments.