1. Institut für Organische Chemie der Justus-Liebig-Universität, Heinrich-Buff-Ring 58, 35392 Giessen, Germany, Department of Organic Chemistry, Kiev Polytechnic Institute, pr. Pobedy, 37, 03056 Kiev, Ukraine, Frankfurt Institute for Advanced Studies, J. W. Goethe University, Max-von-Laue-Str. 1, 60438 Frankfurt, Germany, Department of Chemistry, University of Georgia, Athens, Georgia 30602-2556, and Advanced X-ray Solutions, Bruker AXS Inc., Madison, Wisconsin 12345