Cheng, Hao; Cao, Xianhua; Xian, Ming; Fang, Lanyan; Cai, Tingwei Bill; Ji, Jacqueline Jia; Tunac, Josefino B.; Sun, Duxin; Wang, Peng George Journal of Medicinal Chemistry, 2005, vol. 48, # 2 p. 645 - 652 doi: 10.1021/jm049693a