[1
]Departments
of Chemistry and Molecular Biosciences, Chemistry of Life Processes
Institute,
and the Center for Molecular Innovation and Drug Discovery, Northwestern University,
Evanston, Illinois 60208, United States
[2
]Department
of Chemistry and Biochemistry, Loyola University Chicago, Chicago, Illinois
60660, United States
[3
]Departments
of Chemistry and Molecular Biosciences and the Proteomics Center of
Excellence,
Northwestern University, Evanston, Illinois 60208, United States
[4
]X-ray
Science Division, Advanced Photon Source, Argonne National Laboratory, Lemont,
Illinois 60439, United States