Su, Chung-Ren; Damu, Amooru G.; Chiang, Po-Cheng; Bastow, Kenneth F.; Morris-Natschke, Susan L.; Lee, Kuo-Hsiung; Wu, Tian-Shung Bioorganic and Medicinal Chemistry, 2008, vol. 16, # 11 p. 6233 - 6241 doi: 10.1016/j.bmc.2008.04.032