1. Dept. of Biological Chemistry, Institute for Advanced Chemistry of Catalonia, IQAC-CSIC, Jordi Girona 18-26, 08034 Barcelona, Spain
2. Prozomix Ltd., West End Industrial Estate, Haltwhistle, Northumberland NE49 9HA, United Kingdom
3. Institut für Anorganische Chemie, J.-W.-Goethe-Universität, Frankfurt/Main, Max-von-Laue-Str. 7, D-60438 Frankfurt/Main, Germany
4. Servei de Ressonància Magnètica Nuclear. Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain