Zan, Xin; Gao, Jian; Gu, Guofeng; Liu, Shanshan; Sun, Bin; Liu, Lei; Lou, Hong-Xiang Bioorganic and Medicinal Chemistry Letters, 2014, vol. 24, # 6 p. 1600 - 1604 doi: 10.1016/j.bmcl.2014.01.055