1. Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
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. Institute of Chemistry, University of Tartu, Tartu, Estonia
4. Center for X-ray Crystallography, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States