1. Department of Pharmacy, Università degli Studi di Napoli “Federico II”, Via D. Montesano 49, 80131 Naples, Italy
2. Department of Chemistry “Ugo Schiff″, University of Florence, Via della Lastruccia 13, I-50019 Sesto Fiorentino, Florence, Italy
3. Department of Nuclear Medicine, University Hospital Klinikum Rechts der Isar and Central Institute for Translational Cancer Research (TranslaTUM), Technical University Munich, Munich 81675, Germany
4. Department of Chemistry, Institute for Advanced Study, Technical University Munich, Garching 85748, Germany
5. Department of Pharmacy and Biotechnology, University of Bologna, Via Irnerio 48, 40126 Bologna, Italy