1. Division of Radiopharmaceutical Chemistry, German Cancer Research Center, INF 280, 69120 Heidelberg, Germany
2. Laboratory of Structural Biology, Institute of Biotechnology of the Czech Academy of Sciences, BIOCEV, Prumyslova 595, 252 50 Vestec, Czech Republic
3. Department of Nuclear Medicine, University Hospital Heidelberg, INF 400, 69120 Heidelberg, Germany
4. Institute of Radiopharmaceutical Cancer Research, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany