1. School of Chemistry University of Bristol Cantocks Close Bristol BS8 1TS UK
2. Department of Chemistry University of Victoria Dr. S. T. G. Street Victoria BC V8P 5C2 Canada
3. Instituto de Parasitología y Biomedicina López Neyra CSIC, PTS Granada Avenida del Conocimiento, 17 18016 Armilla, Granada Spain
4. Novartis Institutes for Biomedical Research Novartis Campus 4002 Basel Switzerland