1. CNRS, IRAMIS, SPAM, Laboratoire
Francis Perrin, URA 2453, F-91191 Gif-sur-Yvette, France
2. CEA, INAC, SCIB, UJF & CNRS, LCIB (UMR_E 3 CEA-UJF and FRE 3200), Laboratoire “Lésions des Acides Nucléiques”, 17 Rue des Martyrs, F-38054 Grenoble Cedex 9, France
3. Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston,
Illinois 60208-3113, United States