1. Center for Theoretical and Computational Chemistry, Department of Chemistry, University of Tromso̵, Norway
2. Faculty of Mathematics, Physics and Chemistry, University of Silesia, Bankowa 12, 40-007 Katowice, Poland
3. Institut Für Organische Chemie, Technische Universität Braunschweig, Hagenring 30 D-38106, Braunschweig, Germany
4. Department of Applied Chemistry, Providence University, Taichung 43301, Taiwan