1. Department
of Chemistry, University of Basel, St. Johanns-Ring 19, CH-4056 Basel, Switzerland
2. Department
of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland
3. Medical Parasitology
and Infection Biology, Swiss Tropical and Public Health Institute
(Swiss TPH), Socinstrasse 57, CH-4002 Basel, Switzerland