1. Department
of Chemistry, Chemistry of Life Processes Institute, and Center for
Molecular Innovation and Drug Discovery, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
2. Department
of Molecular Biosciences, Northwestern University, Evanston, Illinois 60208, United States
3. Department
of Chemistry and Biochemistry, Loyola University Chicago, 1068 W. Sheridan
Road, Chicago, Illinois 60660, United States
4. X-ray
Science Division, Argonne National Laboratory, Argonne, Illinois 60439, United States