1. Department of Organic Chemistry; Institute of Chemistry of Romanian Academy; Timisoara 300223 Romania
2. Faculty of Chemistry-Biology-Geography; West University of Timisoara; Timisoara 300115 Romania
3. Faculty of Chemistry; Brno University of Technology; Brno 61200 Czech Republic
4. Institut Català d’Investigació Química; Avgda. Països Catalans 16; Tarragona 43007 Spain