1. Departement of General and Organic Chemistry AOSC, Faculty of Applied Sciences, Free University of Brussels VUV, Pleinlaan 2, Brussels B-1050, Belgium
2. Departement of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Nam. Cs. legii 565, Pardubice 53210, Czech Republic
3. Pharmachemie B. V., Haarlem, The Netherlands