Chen, Cai-Jun; Song, Bao-An; Yang, Song; Xu, Guang-Fang; Bhadury, Pinaki S.; Jin, Lin-Hong; Hu, De-Yu; Li, Qian-Zhu; Liu, Fang; Xue, Wei; Lu, Ping; Chen, Zhuo Bioorganic and Medicinal Chemistry, 2007 , vol. 15, # 12 p. 3981 - 3989