1. Department of Chemistry and Pharmacy Organic Chemistry I and Interdisciplinary Center for Molecular Materials (ICMM) Friedrich-Alexander-Universität Erlangen-Nürnberg Nikolaus-Fiebiger-Straße 10 91058 Erlangen Germany
2. Department of Chemistry and Biochemistry Florida State University Tallahassee FL-32306 USA
3. Swiss Tropical and Public Health Institute Kreuzstr. 2 4123 Allschwil Switzerland
4. University of Basel Petersplatz 1 4001 Basel Switzerland
5. Organic Synthesis and Process Chemistry Division CSIR-Indian Institute of Chemical Technology Hyderabad 500007 India