1. Department of Chemistry, University of Naples “Federico II”, Complesso Universitario Monte S. Angelo, Naples, Italy
2. Institute of Protein Biochemistry, CNR, Naples, Italy
3. Instituto di Biostrutture e Bioimmagini, CNR, Naples, Italy
4. Consorzio Bioteknet, University of Naples, Naples, Italy
5. Dept. Chemistry, University of Naples, Via Cinthia, 80126 Naples, Italy