1. Health Research Institute (INISA), University of Costa Rica, San José 2060, Costa Rica
2. MHIRT Program, University of Texas at El Paso(UTEP), El Paso, TX 79968, United States
3. School of Medicine, University of Costa Rica, San Jose 2060, Costa Rica
4. School of Chemistry, University of Costa Rica, San Jose 2060, Costa Rica
5. Facultad de Ciencias, Departamento de Quimica Organica, Universidad de Santiago de Compostela, Santiago, Spain