1. Institute of Organic Chemistry, Faculty of Chemistry and Pharmacy, University of Regensburg, 93053 Regensburg, Germany
2. Department of Chemistry and Pharmacy, Computer-Chemistry-Center, Friedrich-Alexander-University Erlangen-Nürnberg, 91052 Erlangen, Germany
3. Department of Biosciences and Medical Biology, University of Salzburg, 5020 Salzburg, Austria
4. Institute of Pharmacy, Faculty of Chemistry and Pharmacy, University of Regensburg, 93053 Regensburg, Germany