Affiliation: | YANG Xian-Bin , PEI Xue-Feng JIANG Tian-Yi and SHEN Jia-Xiang(National Laboratory of Natural and Biomimetic Drugs, Beijing Medical University, Beijing 100083, PRC) Laboratory of Medicinal Chemistry, the National Institute of Pharmaceutical Research and Development, P.O. Box 948, Beijing 100083, PRC. |