1. ABX Advanced Biochemical Compounds Biomedizinische Forschungsreagenzien GmbH, Heinrich-Glaeser-Strasse 10-14, D-01454 Radeberg, Germany
2. Department of Pharmacological Chemistry, University of Debrecen, Health and Medical Center, PO Box 70, H-4010 Debrecen, Hungary
3. Department of Organic Chemistry, University of Debrecen, PO Box 20, H-4010 Debrecen, Hungary
4. Institute of Basic Medical Sciences, University of Oslo, PO Box 1105, Blindern, N-0317 Oslo, Norway