1. Research Group for Petrochemistry, Hungarian Academy of Sciences, 8201 Veszprém, Hungary
2. Department of Organic Chemistry, University of Veszprém, 8201 Veszprém, Hungary, Fax: (internat.) +36‐(0)88/427−492
3. Université d’Aix‐Marseille 1 et 3, Faculté des Sciences et Techniques de Saint‐Jérôme, Chimie, Biologie et Radicaux Libres, UMR CNRS 6517, case 432, Avenue Escadrille Normandie‐Niemen, 13397 Marseille Cedex 13, France
4. Research Group for Nuclear Techniques in Structural Chemistry, Hungarian Academy of Sciences at Eötvös University Budapest, Budapest, Hungary