1. Institute
of Pharmacy and Food, University of Havana, San Lázaro y L, 10400,
La Habana, Cuba
2. Instituto de Productos Naturales y Agrobiología-C.S.I.C., Avda. Astrofísico
Francisco Sánchez 3, 38206 La Laguna, Tenerife, Spain
3. Center for Natural Products Study,
Faculty of Chemistry, University of Havana, Zapata y G, 10400, La Habana, Cuba