1. Department of Chemistry and Industrial Chemistry University of Pisa Via G. Moruzzi 13 I-56124 Pisa Italy
2. Department of Pharmaceutical and Pharmacological Sciences University of Padova Via F. Marzolo 5 I-35131 Padova Italy
3. Department of Industrial Chemistry “Toso Montanari” University of Bologna Viale Risorgimento 4 I-40136 Bologna Italy