1. Laboratory of Medicinal Chemistry and Radiopharmacy, Catholic University of Louvain, Avenue Mounier 73.40, B-1200 Brussels, Belgium, Laboratory of Pharmacology, Catholic University of Louvain, Avenue Hippocrate 54, B-1200 Brussels, Belgium, and Laboratory of Toxicologic and Cancerologic Biochemistry, Catholic University of Louvain, Avenue Mounier 73, B-1200 Brussels, Belgium