1. Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
2. Department of Biochemistry and Molecular Biology, Pennsylvania State University, University Park, Pennsylvania 16802, United States
3. National High Magnetic Field Laboratory, Tallahassee, Florida 32310, United States
4. Department of Biochemistry and Molecular Biology, Pennsylvania State University, Hershey, Pennsylvania 17033, United States