1. Laboratory of Macromolecular and Organic ChemistryEindhoven University of Technology P.O. Box 513 NL-5600 MB Eindhoven The Netherlands
2. Institute for Complex Molecular SystemsEindhoven University of Technology The Netherlands
3. Crystal and Structural Chemistry, Bijvoet Center for Biomolecular ResearchUtrecht University Padualaan 8 NL-3584 CH Utrecht The Netherlands