1. Institute of Human Brain of the Russian Academy of Science, Academika Pavlova 9, St. Petersburg, 197376, Russia
2. A. N. Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Science, B-334, Vavilova 28, Moscow, 119991, Russia
3. Center for Radiopharmaceutical Science of ETH, PSI, and USZ, Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland
4. Bayer Schering Pharma AG, Global Drug Discovery, 13342 Berlin, Germany