Lee, Cheng-Lin; Lin, Chi-Fong; Lin, Wan-Ru; Wang, Kun-Sheng; Chang, Ya-Her; Lin, Shinne-Ren; Wu, Yang-Chang; Wu, Ming-Jung Bioorganic and Medicinal Chemistry, 2005, vol. 13, # 20 p. 5864 - 5872 doi: 10.1016/j.bmc.2005.05.050