1. Friedrich-Alexander University Erlangen-Nuernberg
2. Department of Chemistry and Pharmacy
3. Organic Chemistry II
4. 91058 Erlangen
5. Germany
6. Institute of Chemistry
7. Organic Chemistry
8. Martin-Luther-University Halle-Wittenberg
9. D-06120 Halle
10. Chemistry Department
11. Moscow State University
12. Moscow
13. Russian Federation