1. Laboratory of Photochemistry; Department of Drug Sciences; University of Catania; 95125 Catania Italy
2. Department of Science and Drug Technology; University of Torino; 10125 Torino Italy
3. Department of Bio-Medical and Biotechnological Sciences; Physiology Division; University of Catania; 95125 Catania Italy
4. Istituto per la Sintesi Organica e la Fotoreattività-CNR; 40129 Bologna Italy