1. Department of Medicinal Chemistry, School of Pharmacy, Southwest Medical University, Luzhou 646000, China
2. State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China
3. Department of Nuclear Medicine, Affiliated Hospital, Southwest Medical University, Luzhou 646000, China
4. State Key Laboratory of Natural and Biomimetic Drugs, Peking University, Beijing 100191, China