Xiang, Jason; Ipek, Manus; Suri, Vipin; Tam, May; Xing, Yuzhe; Huang, Nelson; Zhang, Yanling; Tobin, James; Mansour, Tarek S.; McKew, John Bioorganic and Medicinal Chemistry, 2007 , vol. 15, # 13 p. 4396 - 4405