1. Department of Chemistry and Biochemistry, University of Oklahoma, Norman, Oklahoma 73019, United States
2. Laboratory of Computational Biology, National, Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland 20824, United States
3. Department of Chemistry and Chemical Biology, Indiana University-Purdue University Indianapolis, Indianapolis, Indiana 46202, United States
4. Department of Chemistry and Biochemistry, University of Texas at Arlington, Arlington, Texas 76019, United States
5. Department of Chemistry and Biochemistry, San Diego State University, San Diego, California 92182, United States