1. Wolfson Laboratory of Medicinal Chemistry Department of Pharmacy and Pharmacology University of Bath Claverton Down BA2 7AY Bath UK
2. Present address: Department of Medicinal Chemistry School of Pharmacy University of Florida 1345 Center Dr. Gainesville FL 32611 USA
3. Institute of Biochemistry Faculty of Medicine University of Ljubljana Vrazov trg 2 1000 Ljubljana Slovenia
4. Drug Discovery & Medicinal Chemistry Department of Pharmacology University of Oxford Mansfield Road Oxford OX1 3QT UK