1Stereochemistry Research Group of the Hungarian Academy of Sciences, Dóm tér 8, H-6720 Szeged, Hungary
2Department of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary
3Institute of Pharmaceutical Chemistry, University of Szeged, Eötvös u. 6, H-6720 Szeged, Hungary