1. State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, Lanzhou University, Lanzhou, Gansu 730000, People's Republic of China
2. College of Chemistry & Chemical Engineering, Northwest Normal University, Lanzhou 730070, People's Republic of China
3. Institute of Anatomy and Histology & Embryology, Neuroscience, School of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, People's Republic of China