1. Department
of Organic Chemistry, Institute of Chemistry, University of Campinas, UNICAMP, 13083-970 Campinas, SP, Brazil
2. Department
of Microbiology, Institute of Biomedical Sciences, University of São Paulo, USP, 05508-900 São Paulo, SP, Brazil
3. Department
of Chemistry, Federal University of Minas Gerais, UFMG, 31270-901 Belo
Horizonte, MG, Brazil