1. Laboratory of Structural Biology, National Institute of Environmental Health Sciences/National Institutes of Health, Research Triangle Park, North Carolina, USA
2. Department of Chemistry, North Carolina State University, 27695-8204, Raleigh, NC
3. Laboratory of Molecular Carcinogenesis, National Institute of Environmental Health Sciences/National Institutes of Health, Research Triangle Park, North Carolina, USA
4. Department of Chemistry, North Carolina State University, Raleigh, North Carolina, USA