1. State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, MOE Frontiers Science Center for Rare Isotopes, Lanzhou Magnetic Resonance Center, Lanzhou University, Lanzhou 730000, P.R. China
2. Department of Nuclear Medicine, MOE Frontiers Science Center for Rare Isotopes, Second Hospital of Lanzhou University, Lanzhou University, Lanzhou 730030, P.R. China