Kerem, Z., Inst. of Biochem., Food Sci./Nutr., Fac. of Agric., Food/Qual. Sciences, Hebrew University of Jerusalem, P.O. Box 12, Rehovot 76100, Israel
Regev-Shoshani, G., Inst. of Biochem., Food Sci./Nutr., Fac. of Agric., Food/Qual. Sciences, Hebrew University of Jerusalem, P.O. Box 12, Rehovot 76100, Israel
Flaishman, M.A., Department of Fruit Trees, Institute of Horticulture, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Sivan, L., Inst. of Biochem., Food Sci./Nutr., Fac. of Agric., Food/Qual. Sciences, Hebrew University of Jerusalem, P.O. Box 12, Rehovot 76100, Israel, Department of Fruit Trees, Institute of Horticulture, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel

The roots of Rumex bucephalophorus were analyzed for resveratrol and analogues. Two stilbene-O-methyl derivatives were identified, in addition to resveratrol (3,5,4′-trihydroxystilbene). The stilbene-O-methyl derivatives were shown to be 5,4′-dihydroxy-3-methoxystilbene and 3,5-dihydroxy-4′-methoxystilbene. The antioxidant capacities of all these stilbenes were determined.