1. Research Group on Natural Products (Center for Research in Sciences and Technology), Universidade de Franca, Av. Dr. Armando de Sales Oliveira, 201 - Parque Universitário, Franca, São Paulo 14404-600, Brazil
2. Department of Biochemistry and Immunology, Ribeirão Preto Medical School, Universidade de São Paulo, Avenida Bandeirantes 3900, Ribeirão Preto, São Paulo 14049-900, Brazil