1. Laboratoire de Pharmacognosie, U.R.A. 1843 CNRS (BIOCIS), Faculté de Pharmacie, 92296 Châtenay-Malabry, France
2. Laboratory of Organic Chemistry, Department of Chemistry, University of Paraiba, 58000 João Pessoa, Paraiba, Brazil
3. Instituto de Investigationes en Ciencias de la Salud, Asuncion, Paraguay