Liu, Zijian; Wang, Rui; Guo, Ruiming; Hu, Jinxing; Li, Ruijuan; Zhao, Yanfang; Gong, Ping Bioorganic and Medicinal Chemistry, 2014, vol. 22, # 14 p. 3642 - 3653 doi: 10.1016/j.bmc.2014.05.013