1. Theoretical and Physical Chemistry Institute National Hellenic Research Foundation 48 Vassileos Constantinou Avenue 11635 Athens Greece
2. Department of Chemistry University of North Texas 1155 Union Circle, 305070 Denton TX 76203-5017 USA
3. Área de Química Orgánica Instituto de Bioingeniería Universidad Miguel Hernández 03202 Elche Spain
4. Department of Chemistry Nagoya University Nagoya 464-8602 Japan