1. University of Pannonia, Department of Organic Chemistry, Egyetem u. 10, P.O. Box 158, H-8200 Veszprém, Hungary
2. Hungarian Research Network, Research Centre for Natural Sciences, Magyar tudósok körútja 2, H-1117 Budapest, Hungary
3. Chemical Works of Gedeon Richter Plc., 1103 Budapest, Gyömrői út 19-21, Hungary