1. Department of Chemistry Institute of Pharmacy Universität Hamburg Bundesstrasse 45 20146 Hamburg Germany
2. Department of Microbiology and Biotechnology Universität Hamburg Ohnhorststrasse 18 22609 Hamburg Germany
3. Heinrich-Pette-Institute Leibniz Institute for Experimental Virology Martinistrasse 52 20251 Hamburg Germany
4. Institute for Virology University for Veterinary Medicine Hannover Buenteweg 17 30559 Hannover Germany
5. Department of Pharmaceutical Chemistry University of Vienna Althanstrasse 14 1090 Vienna Austria