1. Department of Chemistry, University of Southern California, Los Angeles, California 90089-0482
2. Departments of Physics and Measurements and of Analytical Chemistry, Institute of Chemical Technology, Prague, Technicka 5, 16628 Prague, Czech Republic
3. Synthesis Development Group II, R&D Division, Zentiva, a.s., U Kabelovny 130, 10237 Prague 10, and Department of Organic and Nuclear Chemistry, Faculty of Science, Charles University, Hlavova 8, 12840 Prague 2, Czech Republic