1. Institut de Química Computacional
and Departament de Química, Universitat de Girona, Campus Montilivi,
17071 Girona, Catalonia, Spain
2. Laboratoire de Chimie Physique,
CNRS, Bât. 349, UMR 8000, Orsay F-91405, France and Université
Paris-Sud, Orsay F-91405, France
3. Institute of Biology, Medicinal
Chemistry and Biotechnology, National Hellenic Research Foundation,
48 Vas. Constantinou Ave., Athens 116 35, Greece
4. Department of Chemistry and
Biochemistry, University of California, Santa Barbara, California
93106, United States