1. Center for Heterocyclic Compounds, Department
of Chemistry, University of Florida, Gainesville,
Florida 32611-7200, United States
2. Department of Sustainable Organic Chemistry and Technology, Faculty
of Bioscience Engineering, Ghent University, B-9000 Ghent, Belgium
3. Institut für Pharmazeutische und Medizinische Chemie, Heinrich Heine Universität Düsseldorf, Universitätsstrasse 1, 40225 Düsseldorf, Germany
4. Chemistry Department, King Abdulaziz University, Jeddah, 21589 Saudi Arabia