1. Department of Chemistry Universidade Federal de Minas Gerais Av. Pres. Antônio Carlos 6627. Campus Pampulha. CEP 31270-901. Belo Horizonte. MG. Brazil
2. Department of Chemistry and Molecular Biology University of Gothenburg Kemivägen 10 41296, Göteborg Sweden
3. Department of Chemistry Universidade Federal de Viçosa Av. P. H. Rolfs, s/n, CEP 36570-900 Viçosa, MG Brazil
4. Organic Chemistry Martin-Luther-University Halle-Wittenberg Kurt-Mothes-Str.2. D-06120 Halle (Saale Germany