1. Department of Chemistry and Pharmacy; University of Sassari; via F. Muroni 23/A 07100 Sassari Italy
2. Dipartimento di Scienze Mediche, Sezione di Farmacologia; Università di Ferrara; Via Fossato di Mortara, 17-19 44121 Ferrara Italy
3. Department of Chemistry and Biochemistry; University of North Carolina at Greensboro; Greensboro NC 27402 USA
4. Institute of Translational Pharmacology; National Research Council; 09010 Pula Cagliari Italy