Isomeric kielcorins and dihydroxyxanthones. Synthesis, structure elucidation and inhibitory activities of growth of human cancer cell lines and on the proliferation of human lymphocytes in vitro - Sousa,E.P.; Silva ,A.MS.; Pinto,M.MM.; Pedro,M.M.; Cerqueira,F.AM.; Nascimento,M.SJ. (Helv Chim Acta, 2002)