1. Free Radical and Antioxidants Laboratory, Faculty of Chemical and Pharmaceutical Sciences; University of Chile; Santiago Chile
2. Department of Pharmacology, Davis Heart and Lung Research Institute, College of Medicine; The Ohio State University; Columbus OH 43210 USA
3. Molecular Graphics Unit, Faculty of Chemical and Pharmaceutical Sciences; University of Chile; Santiago Chile
4. Departamento de Química Orgánica, Facultad de Farmacia; Universidad de Santiago de Compostela; 15782 Santiago de Compostela Spain
5. Facultad de Química; Pontificia Universidad Católica de Chile; Santiago Chile