1. Natural Product Research Laboratory
2. School of Chemistry and Pharmacy
3. University of El Salvador
4. San Salvador
5. El Salvador
6. DIFACQUIM Research Group
7. Department of Pharmacy
8. School of Chemistry
9. National Autonomous University of Mexico
10. Mexico City 04510
11. Center for Pharmacognostic Research on Panamanian Flora (CIFLORPAN)
12. College of Pharmacy
13. University de Panama
14. Panama
15. Sistema Nacional de Investigación (SNI)