1. Postgraduate Program in Natural and Synthetic Bioactive Products, Federal University of Paraiba, Joao Pessoa, PB, Brazil
2. University of Western Sao Paulo (Unoeste), Presidente Prudente, SP, Brazil
3. Department of Organic Chemistry, Faculty of Science, University of Yaounde IPO Box 812, Yaounde, Cameroon
4. Laboratory of Synthesis and Drug Delivery, Department of Biological Science, State University of Paraiba, Joao Pessoa, PB, Brazil