1. Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
2. Department of Chemistry and Biochemistry, Baylor University, Waco, Texas 76798, United States
3. Department of Chemistry, Florida State University, Tallahassee, Florida 32306, United States
4. Verna & Marrs McLean Department of Biochemistry & Molecular Biology, Baylor College of Medicine, One Baylor Plaza, Houston, Texas 77030-3411, United States
5. National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, United States