1. Center for Molecular Modeling, QCMM Alliance Ghent-Brussels, Ghent University, Technologiepark 903, B-9052 Zwijnaarde, Belgium
2. Department of Inorganic and Physical Chemistry, QCMM Alliance Ghent-Brussels, Ghent University, Krijgslaan 281 (S-3), B-9000 Gent, Belgium
3. Department of Chemistry, McMaster University, 1280 Main Street West, Hamilton, Ontario, Canada