Cheng, Wei-Chieh; Weng, Chen-Yi; Yun, Wen-Yi; Chang, Shang-Yu; Lin, Yu-Chun; Tsai, Fuu-Jen; Huang, Fu-Yung; Chen, Yun-Ru Bioorganic and Medicinal Chemistry, 2013, vol. 21, # 17 p. 5021 - 5028 doi: 10.1016/j.bmc.2013.06.054