1. Department of Chemistry, Georgetown University, Washington, District of Columbia 20057, United States
2. International Centre for Diffraction Data, Newtown Square, Pennsylvania 19073, United States
3. Illinois Institute of Technology, 3101 S. Dearborn Street, Chicago, Illinois 60616, United States
4. North Central College, 131 S. Loomis Street, Naperville, Illinois 60540, United States