Chen, Jing; Jiang, Cheng-Shi; Ma, Wen-Quan; Gao, Li-Xin; Gong, Jing-Xu; Li, Jing-Ya; Li, Jia; Guo, Yue-Wei Bioorganic and Medicinal Chemistry Letters, 2013 , vol. 23, # 18 p. 5061 - 5065