1. Department
of Biological Sciences, Webster University, St. Louis, Missouri 63119, United States
2. Department
of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
3. Department
of Chemistry and Biochemistry, W. M. Keck Foundation Center for Molecular
Structure, California State University San Marcos, San Marcos, California 92096, United States
4. Bruker AXS Inc., 5465
East Cheryl Parkway, Madison, Wisconsin 53711, United States