Dihydroxyxanthones prenylated derivatives: Synthesis, structure elucidation, and growth inhibitory activity on human tumor cell lines with improvement of selectivity for MCF-7 - Castanheiro, R.A.P.; Pinto, M.M.M.; Silva, A.M.S.; Cravo, S.M.M.; Gales, L.; Damas, A.M.; Nazareth, N.; Nascimento, M.S.J.; Eaton, G. (Bioorganic and Medicinal Chemistry, 2007)