1. Department of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487-0336, United States
2. Department of Pharmacognosy, University of Pécs, Medical School, H-7624 Pécs, Rókus u. 2, Pécs, Hungary
3. Department of Biochemistry and Medical Chemistry, University of Pécs, Medical School, H-7624 Pécs, Szigeti út 12, Pécs, Hungary