Li, Sai; Zhao, Yanfang; Wang, Kewen; Gao, Yali; Han, Jianming; Cui, Bingbing; Gong, Ping Bioorganic and Medicinal Chemistry, 2013, vol. 21, # 11 p. 2843 - 2855 doi: 10.1016/j.bmc.2013.04.013