ACKNOWLEDGMENTS
We thank the Swiss National Science Foundation and the Roche Research Foundation for financial support, Dr. Gerd Scherer (Organic Chemistry, Univ. Basel) for the 600 MHz 1H NMR spectra, Prof. Hanspeter Huber and Patrick Vogt (Physical Chemistry, Univ. Basel) and the staff of CSCS responsible for the NEC SX5 (Centro Svizzero di Calcolo Scientifico, Manno (Lugano)) for ongoing technical advice and support. The details of this study will be published elsewhere.