1. Departamento
de Química Orgánica y Bio-Orgánica, Facultad
de Ciencias, Universidad Nacional de Educación a Distancia, Paseo Senda
del Rey 4, 28040 Madrid, Spain
2. Key
Laboratory of Marine Drugs of Ministry of Education, School of Medicine
and Pharmacy, Ocean University of China, Qingdao 266003, China
3. Escuela
de Química, Universidad Nacional of Costa Rica, Post Office Box 86, 3000 Heredia, Costa Rica
4. Division
of Chemical Biology and Medicinal Chemistry, Eshelman School of Pharmacy, University of North Carolina, Chapel Hill, North Carolina 27599, United States
5. Departamento
de Química Orgánica y Farmacéutica, Facultad
de Farmacia, Universidad Complutense de Madrid, Pz/Ramón
y Cajal s/n, 28040 Madrid, Spain
6. Center for Biotechnology & Interdisciplinary Studies and Department of Chemistry & Chemical Biology, Rensselaer Polytechnic Institute, Biotechnology Center 4005, Troy, New York 12180, United States