1. Instituto de Medicina Tropical, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo – 05403-000, Brazil
2. Centre for Parasitology and Mycology, Instituto Adolfo Lutz, São Paulo – 01246-000, Brazil
3. Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford, OX1 3TA, UK