1. Department of Pharmaceutical Chemistry Tokyo University of Pharmacy and Life Sciences 1432-1 Horinouchi, Hachioji Tokyo 192-0392 Japan
2. Humboldt-Universität zu Berlin Brook-Taylor-Straße 2 12489 Berlin Germany
3. Department of Organic Chemistry University of Chemical Technology and Metallurgy 8 St. Kliment Ohridski blvd 1756 Sofia Bulgaria
4. Institute of Optical Materials and Technologies Bulgarian Academy of Sciences Acad. G. Bonchev avenue, bldg. 109 1113 Sofia Bulgaria
5. Institute of Electronics Bulgarian Academy of Sciences 72 Tzarigradsko chaussee blvd 1784 Sofia Bulgaria
6. Institute of Organic Chemistry with Centre of Phytochemistry Bulgarian Academy of Sciences Acad. G. Bonchev avenue, bldg. 9 Sofia 1113 Bulgaria