1. Department of Industrial Chemistry “Toso Montanari”Alma Mater Studiorum-University of Bologna Viale del Risorgimento 4 40136 Bologna Italy
2. Faculty of PharmacyDepartment of Pharmaceutical ChemistryUniversity of Athens, Panepistimioupolis-Zografou 15771 Athens Greece
3. current address: Pharmaceutical and Medicinal Chemistry, Institute of Pharmacy and Food ChemistryJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany