1. Laboratorium für Organische Chemie; ETH Zürich; Vladimir-Prelog-Weg 3 8093 Zürich Switzerland
2. Departments of Biochemistry, Medical Biophysics, and Molecular Genetics; University of Toronto; Medical Sciences Building, #5358, 1 King's College Circle Toronto ON M5S 1A8 Canada
3. The Campbell Family Institute for Cancer Research; University Health Network; 101 College Street Toronto ON M5G 1L7 Canada
4. Swiss Tropical and Public Health Institute; Socinstrasse 57 4002 Basel Switzerland
5. University of Basel; Petersplatz 1 4003 Basel Switzerland
6. Biochemie-Zentrum Heidelberg (BZH); Universität Heidelberg; Im Neuenheimer Feld 328 69120 Heidelberg Germany