1. Chemistry in Pharmaceutical Sciences Department. Universidad Complutense de Madrid, Pz/Ramón y Cajal s/n, 28040 Madrid, Spain
2. Department of Drug Sciences, University of Pavia, Viale Taramelli 12, I-27100 Pavia, Italy
3. Department of Organic Chemistry, Universidad Autónoma de Madrid, Campus de Cantoblanco, 28049 Madrid, Spain