1. Department of Medicinal Chemistry; Key Laboratory of Chemical Biology (MOE); School of Pharmaceutical Sciences; Shandong University; Jinan Shandong 250012 China
2. State Key Laboratory of Microbial Resources; Institute of Microbiology; Chinese Academy of Sciences; Beijing 100190 China
3. Department of Natural Products; Key Laboratory of Chemical Biology (MOE); School of Pharmaceutical Sciences; Shandong University; Jinan Shandong 250012 China