1. Istituto di Chimica Biomolecolare, Consiglio Nazionale delle Ricerche, c/o Università di Roma “La Sapienza”, Piazzale Aldo Moro, 5, 00185 Roma, Italy
2. Chemistry M313, School of Biomedical, Biomolecular and Chemical Sciences, The University of Western Australia, Crawley, WA 6009, Australia
3. Department of Physics, University of Warwick, Gibbet Hill Rd., Coventry CV4 7AL, UK
4. School of Science and Technology, Università degli Studi di Camerino, Via S. Agostino 1, 62032 Camerino MC, Italy, Fax: +39‐0737‐637345
5. School of Pharmacy, Università degli Studi di Camerino, Via S. Agostino 1, 62032 Camerino MC, Italy, Fax: +39‐0737‐637345
6. Vassar College, Department of Chemistry, Poughkeepsie, New York 12604‐0484, USA