1. 1School of Chemical Sciences and National Institute for Cellular Biotechnology, Dublin City University, Dublin 9, Ireland
2. 2German Aerospace Center (DLR), Solarforschung, Linder Höhe, D-51147 Cologne, Germany
3. 3Organic Chemistry I, Department of Chemistry, University of Bielefeld, P.O. Box 10 01 31, D-33501 Bielefeld, Germany