1. Institute of Exact Sciences; Department of Chemistry; Federal University of Minas Gerais; UFMG 31270-901 Belo Horizonte, MG Brazil
2. Institut für Organische und Biomolekulare Chemie; Georg-August-Universität Göttingen; Tammannstraße 2 37077 Göttingen Germany
3. Institute of Chemistry and Biotechnology; Federal University of Alagoas; UFMG 31270-901 Belo Horizonte, MG Brazil
4. Oswaldo Cruz Institute, FIOCRUZ; UFAL 57072-970 Maceió, AL Brazil
5. Division of Bioorganic Chemistry; School of Pharmacy; Saarland University; 66123 Saarbrücken Germany