Qi, Baohui; Mi, Bin; Zhai, Xin; Xu, Ziyi; Zhang, Xiaolong; Tian, Zeru; Gong, Ping Bioorganic and Medicinal Chemistry, 2013, vol. 21, # 17 p. 5246 - 5260 doi: 10.1016/j.bmc.2013.06.026