1. Department of ChemistryUniversity of Pavia V. le Taramelli 10 27100 Pavia Italy
2. Oncogenomic and Epigenetic UnitIRCCS Regina Elena National Cancer Institute Via Elio Chianes 53 00144 Rome Italy
3. Present address: Institute of Molecular Biology and Pathology (IBPM)National Research Council (CNR) Via degli Apuli 4 00185 Rome Italy
4. Institute for Organic Synthesis and Photoreactivity (ISOF)National Research Council (CNR) Via P. Gobetti 101 40129 Bologna Italy
5. Department of Molecular MedicineUniversity of Padua Via Gabelli 63 35121 Padua Italy