1. Research Group on Natural ProductsCenter for Research in Sciences and TechnologyUniversity of Franca Avenida Dr. Armando Salles of Oliveira, CEP 14404-600 Franca SP Brazil
2. School of Pharmaceutical Sciences of Ribeirão PretoUniversity of São Paulo Av. do Café, s/n, CEP 14.040-903 Ribeirão Preto SP Brazil
3. Center for Discovery and Innovation in Parasitic DiseasesSkaggs School of Pharmacy and Pharmaceutical SciencesUniversity of California San Diego 9500 Gilman Drive, La Jolla CA 92093 USA