1. University of Campinas Institute of Chemistry, Department of Organic Chemistry, Laboratory of Experimental and Theoretical Organic Chemistry PO Box 6154, 270 Monteiro Lobato street 13083-970 Campinas São Paulo Brazil
2. Department of Chemistry Federal University of Lavras Campus da UFLA, Caixa-postal: 3037 37200000 Lavras, MG Brasil
3. UFLA – Campus Universitario Department of Chemistry PO Box 3037 37200-000 Lavras Minas Gerais
4. University of Campinas Faculty of Pharmaceutical Sciences 200 Cândido Portinari Street 13083871 Campinas São Paulo Brazil