1. Center for Heterocyclic Compounds Department of Chemistry University of Florida Gainesville FL 32611 USA
2. Department of Biotechnology and Life Science, Graduate School of Technology Tokyo University of Agriculture and Technology 2-24-16, Naka-cho, Koganei city 184-8588 Tokyo Japan
3. Department of Chemistry and Chemical Biology, Rutgers The State University of New Jersey Piscataway NJ 08854 USA
4. Center for X-ray Crystallography Department of Chemistry University of Florida Gainesville FL 32611 USA
5. Institute of Chemistry University of Tartu Tartu Estonia