1. From the Department of Research and Innovation, Imaging and Biological Research Division, Guerbet Group, BP57400, 95943 Roissy CDG, France (P.R., C.F., V.V., J.L., M.R., R.S., S.B., J.M.I., C.C.); and Institute of Inorganic and Analytical Chemistry, University of Münster, Münster, Germany (S.F., M.S., U.K.).