1. Instituto de Química Médica, Consejo Superior de Investigaciones Científicas, 28006Madrid, Spain
2. Center for Substance Abuse Research, Temple University, Philadelphia, Pennsylvania19122, United States
3. Center for Drug Discovery, Department of Chemistry and Biochemistry, University North Carolina, Greensboro, North Carolina27599, United States
4. Department of Biochemistry and Molecular Biology, Faculty of Medicine, Complutense University, CIBERNED and IRYCIS, 28040Madrid, Spain