1. College of Science
2. Hunan Agricultural University
3. Changsha 410128
4. P. R. China
5. Key Laboratory of Theoretical Organic Chemistry and Functional Molecules
6. Ministry of Education
7. School of Chemistry and Chemical Engineering
8. Hunan University of Science and Technology
9. Xiangtan
10. Department of Chemistry
11. University of Wrocław
12. 50 383 Wrocław
13. Poland