1. 1Structural Chemistry Group, Department of Chemistry, University of Turku, FIN-20014 Turku, Finland
2. 2Department of Biosciences, Division of General Microbiology, University of Helsinki, FIN-00014 Helsinki, Finland
3. 3Department of Pharmacy, Viikki Drug Discovery Technology Center, University of Helsinki, FIN-00014 Helsinki, Finland
4. 4Department of Chemistry, University of Jyväskylä, FIN-40500 Jyväskylä, Finland