1. Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-10691 Stockholm, Sweden
2. Institute of Chemistry, NAWI Graz, BioTechMed Graz, University of Graz, Heinrichstrasse 28, A-8010 Graz, Austria
3. Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warszawa, Poland