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1 Laboratoire d'Hétérochimie Fondamentale et Appliquée (UPRES-A CNRS 5069), 118 route de Narbonne, Université Paul Sabatier (Bât 2R1), F-31062 Toulouse Cedex 04, France, Centre de Recherche Rhône-Alpes, Elf-Atochem, BP 63, F-69493 Pierre Bénite, France, and Department of Chemistry, Texas A&M University, College Station, Texas 77843-3255.
1 Laboratoire d'Hétérochimie Fondamentale et Appliquée (UPRES-A CNRS 5069), 118 route de Narbonne, Université Paul Sabatier (Bât 2R1), F-31062 Toulouse Cedex 04, France, Centre de Recherche Rhône-Alpes, Elf-Atochem, BP 63, F-69493 Pierre Bénite, France, and Department of Chemistry, Texas A&M University, College Station, Texas 77843-3255.