1. Department of Chemistry and PharmacyPhysical Chemistry IFriedrich-Alexander University Erlangen-Nürnberg Egerlandstrasse 3 91058 Erlangen Germany
2. Institute of Organic Chemistry IUniversity of Ulm Albert-Einstein-Allee 11 89081 Ulm Germany
3. Department of Chemistry and PharmacyTheoretical ChemistryFriedrich-Alexander University Erlangen-Nürnberg Egerlandstrasse 3 91058 Erlangen Germany