1. Department of Organic Chemistry, Institute of Organic Chemistry, Catalysis and Petrochemistry, Slovak University of Technology, Radlinského 9, SK-812 37 Bratislava, Slovakia
2. Georganics, Ltd., Koreničova 1, SK-811 03 Bratislava, Slovakia
3. Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K.