Synthesis, SAR and biological evaluation of natural and non-natural hydroxylated and prenylated xanthones as antitumor agents - Zhang, X; Li, X; Ye, S; Zhang, Y; Tao, L; Gao, Y; Gong, D; Xi, M; Meng, H; Zhang, M; Gao, W; Xu, X; Guo, Q; You, Q (Med Chem, 2012)