1. Wolfson Laboratory of Medicinal Chemistry, University of Bath, Department of Pharmacy and Pharmacology, Claverton Down, Bath, BA2 7AY, United Kingdom, The Calcium Signaling Group, Institute of Biochemistry and Molecular Biology I: Cellular Signal Transduction, Center of Experimental Medicine, University Medical Center Hamburg−Eppendorf, Martinistrasse 52, D-20246 Hamburg, Germany, and Department of Pharmacology, University of Oxford, Mansfield Road, Oxford OX1 3QT, United Kingdom