1. Departamento de Química Inorgánica y Bioinorgánica
2. Facultad de Farmacia
3. Universidad Complutense de Madrid
4. 28040 Madrid, Spain
5. Networking Research Center on Bioengineering
6. Department of Chemical and Geological Sciences
7. University of Modena and Reggio Emilia
8. 41125 Modena, Italy