1. Department of Organic Chemistry Vilnius University Naugarduko 24 LT-03225 Vilnius Lithuania
2. Present Address: Molecular Design and Synthesis Department of Chemistry KU Leuven Celestijnenlaan 200F Box 2404 3001 Leuven Belgium
3. Department of Organic Chemistry Center for Physical Sciences and Technology Akademijos 7 LT-08412 Vilnius Lithuania