Zhu, Jinmei; Wu, Chun-Feng; Li, Xiaobing; Wu, Gui-Sheng; Xie, Shan; Hu, Qian-Nan; Deng, Zixin; Zhu, Michael X.; Luo, Huai-Rong; Hong, Xuechuan Bioorganic and Medicinal Chemistry, 2013 , vol. 21, # 14 p. 4218 - 4224