1. Department of Natural Medicinal Chemistry and Pharmacognosy, School of Pharmacy, Qingdao University, Qingdao 266071, People’s Republic of China
2. Department of Pharmacology, School of Pharmacy, Qingdao University, Qingdao 266071, People’s Republic of China
3. State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, People’s Republic of China
4. Department of Natural Product Chemistry, Key Laboratory of Chemical Biology of Ministry of Education, School of Pharmaceutical Sciences, Shandong University, Jinan 250012, People’s Republic of China