1. Department of Organic Chemistry, Center for Physical Sciences and Technology, Sauletekio Ave. 3, Vilnius LT-10257, Lithuania
2. Institute of Solid State Physics, Vienna Technical University, Wiedner Hauptstrasse 8-10, 1040 Vienna, Austria
3. Institute of Biotechnology, Life Sciences Center, Vilnius University, Sauletekio 7, LT-10257 Vilnius, Lithuania