Li, Wen-Qun; Wang, Xu-Li; Qian, Keduo; Liu, Ying-Qian; Wang, Chih-Ya; Yang, Liu; Tian, Jin; Morris-Natschke, Susan L.; Zhou, Xing-Wen; Lee, Kuo-Hsiung Bioorganic and Medicinal Chemistry, 2013, vol. 21, # 8 p. 2363 - 2369 doi: 10.1016/j.bmc.2013.01.069