1. Department of Chemistry, Laboratory of Organic Chemistry, University of Athens, Panepistimiopolis, Zografou, 15771, Athens (Greece), Fax: (+30) 210‐727‐4761
2. Present address: Department of Chemistry, Laboratory of Organic Chemistry, Aristotle University of Thessaloniki, University Campus, 54124, Thessaloniki (Greece)
3. CEA‐Saclay, Service d'Ingénierie Moléculaire des Protéines, Labex LERMIT, CEA‐DSV‐iBiTecS, 91191 Gif/Yvette (France)
4. National Center for Scientific Research, “Demokritos”, Aghia Paraskevi Attikis, GR 15310 (Greece)