1. Department of Chemistry, University at Buffalo, SUNY, Buffalo, New York 14260-3000, United States
2. Biocenter Oulu, University of Oulu, P.O. Box 5000, FIN-90014 Oulu, Finland
3. Faculty of Biochemistry and Molecular Medicine, University of Oulu, P.O. Box 5400, FIN-90014 Oulu, Finland