1. College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, Gansu, 730070, P. R. China
2. State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Gansu 730000, P. R. China
3. Syngenta Jealott's Hill International Research Centre, Bracknell, Berkshire, RG42 6EY, UK
4. MOE Frontiers Science Center for Rare Isotopes, Lanzhou University, Lanzhou, Gansu 730000, P. R. China