1. Zernike Institute for Advanced MaterialsUniversity of Groningen Nijenborgh 4 9747 AG Groningen The Netherlands
2. Current affiliation: Faculty of PhysicsUniversity of Vienna Strudlhofgasse 4 1090 Vienna Austria
3. Stratingh Institute for ChemistryUniversity of Groningen Nijenborgh 7 9747 AG Groningen The Netherlands
4. Ghent Quantum Chemistry GroupDepartment of Inorganic and Physical ChemistryGhent University Krijgslaan 281 (S3) 9000 Ghent Belgium
5. Department of Drug Design and Optimization (DDOP)Helmholtz Institute for Pharmaceutical Research Saarland 66123 Saarbrücken Germany
6. Department of PharmacySaarland University Campus Building E8.1 66123 Saarbrücken Germany