Chang, Shaohua; Zhang, Zhang; Zhuang, Xiaoxi; Luo, Jinfeng; Cao, Xianwen; Li, Honglin; Tu, Zhengchao; Lu, Xiaoyun; Ren, Xiaomei; Ding, Ke Bioorganic and Medicinal Chemistry Letters, 2012 , vol. 22, # 2 p. 1208 - 1212