1. Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education); Department of Chemistry; Wuhan University; Wuhan 430072 P. R. China
2. College of Chemistry and Chemical Engineering; Lanzhou University; Lanzhou 730000 P. R. China
3. Gansu Institute for Drug Control; Lanzhou 730070 P. R. China
4. Department of Chemistry; Wuhan University; Wuhan 430072 P. R. China