Su, Ting; Wu, Yanhong; Doughan, Brandon; Jia, Zhaozhong J.; Woolfrey, John; Huang, Brian; Wong, Paul; Park, Gary; Sinha, Uma; Scarborough, Robert M.; Zhu, Bing-yan Bioorganic and Medicinal Chemistry Letters, 2001 , vol. 11, # 22 p. 2947 - 2950