1. Fujian Key Laboratory of Drug Target Discovery and Structural and Functional Research The School of Pharmacy Fujian Medical University Fuzhou 350108 P. R. China
2. The Department of Basic Chemistry The School of Pharmacy Fujian Medical University Fuzhou 350108 P. R. China
3. The School of Medical Technology and Engineering Fujian Medical University Fuzhou 350004 P. R. China
4. Laboratory of Theoretical and Computational Chemistry Institute of Theoretical Chemistry Jilin University Changchun 130023 P. R. China