1. Department of Natural Medicinal Chemistry and Pharmacognosy, School of Pharmacy, Qingdao University, Qingdao, People’s Republic of China
2. Cancer Institute, Affiliated Hospital of Qingdao University, School of Basic Medicine of Qingdao University, Qingdao, People’s Republic of China
3. Key Laboratory of Chemical Biology of Ministry of Education, Department of Natural Product Chemistry, School of Pharmaceutical Sciences, Shandong University, Jinan, People’s Republic of China
4. Affiliated Hospital of Qingdao University, Qingdao, People’s Republic of China