1. Fundação Oswaldo Cruz (Fiocruz), Instituto Gonçalo Moniz, Salvador, 40296-710Bahia, Brazil
2. South African Medical Research Council Drug Discovery and Development Research Unit, Department of Chemistry and Institute of Infectious Diseases and Molecular Medicine, University of Cape Town, Rondebosch7701, South Africa
3. São Carlos Institute
of Physics, University of São Paulo, São Carlos, 13566-590São Paulo, Brazil