1. Department of Chemistry; Rice University; 6100 Main Street; Houston; Texas; 77005-1892
2. Faculty of Chemistry, Theoretical Chemistry Group; Institute of Physical and Theoretical Chemistry, Wroclaw University of Technology; Wyb. Wyspiańskiego 27, PL-50370 Wrocław; Poland
3. Institute of Computational Chemistry and Catalysis (IQCC), Department of Chemistry; University of Girona; Campus Montilivi, 17071 Girona; Spain
4. Department of Chemistry and Biochemistry; University of California; Santa Barbara; California; 93106
5. Institute of Biology, Medicinal Chemistry and Biotechnolology, The National Hellenic Research Foundation 48 Vas. Constantinou Avenue; 11635; Athens; Greece