1. Laboratory of Chemical Biology Department of Biomedical, Engineering and Institute for Complex Molecular Systems Eindhoven University of Technology P.O. Box 513 5600 MB Eindhoven The Netherlands
2. Taros Chemicals GmbH & Co. KG Emil-Figge-Straße 76a 44227 Dortmund Germany
3. Department of Chemistry University of Duisburg-Essen Universitätsstrasse 7 45117 Essen Germany