1. Faculty of Chemistry and Chemical Biology Technical University Dortmund Otto-Hahn-Str. 4a 44227 Dortmund Germany
2. Faculty for Chemistry and Pharmacy Ludwig-Maximilians-University Munich Butenandtstr. 5–13 81377 Munich Germany
3. Theoretical Chemistry Ruhr University Bochum Universitätsstr. 150 44801 Bochum Germany