1. Key Laboratory of Radiopharmaceuticals, Ministry of Education
2. College of Chemistry
3. Beijing Normal University
4. Beijing 100875
5. P. R. China
6. State Key Laboratory of Virology
7. College of Life Sciences
8. Wuhan University
9. Wuhan 430072
10. People's Republic of China
11. Wuhan Institute for Neuroscience and Neuroengineering
12. South-Central University for Nationalities
13. Wuhan 430074