1. Department
of Chemistry, University of Bari Aldo Moro, Via E. Orabona 4, 70125 Bari, Italy
2. Department
of Pharmaceutical and Pharmacological Sciences, University of Padua, Via Marzolo 5, 35131 Padova, Italy
3. Department
of Chemistry, Eastern Michigan University, 48197 Ypsilanti, Michigan, United States