1. Department of Physiology and Pharmacology, Federal University of Ceará, Fortaleza, 60430-270, Ceará, Brazil
2. Division of Bioorganic Chemistry, School of Pharmacy, University of Saarland, 66123 Saarbruecken, Germany
3. Institute of Exact Sciences, Department of Chemistry, Federal University of Minas Gerais, Belo Horizonte, 31270-901, Minas Gerais, Brazil
4. Department of Chemistry, Federal University of Santa Catarina, Florianópolis, Santa Catarina, 88040-900, Brazil
5. Institute of Chemistry, University of Brasilia, Brasilia, 70904-970, DF, Brazil