1. School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300387, P. R. China
2. State Key Laboratory of Toxicology and Medical Countermeasures, Beijing Institute of Pharmacology and Toxicology, Beijing 100850, P. R. China
3. Tianjin Key Laboratory of Structure and Performance for Functional Molecules, College of Chemistry, Tianjin Normal University, Tianjin 300387, P. R. China
4. School of Chemistry and Chemical Engineering, Henan Normal University, P. R. China