1. Department of Chemistry and Biochemistry, University of Oklahoma, 101 Stephenson Parkway, Norman, Oklahoma 73019, United States
2. Department of Pharmacology and Physiology, Saint Louis University School of Medicine, St. Louis, Missouri 63110, United States
3. Department of Chemistry and Biochemistry, Saint Louis University, St. Louis, Missouri 63110, United States
4. Department of Biological Sciences, University of Alabama in Huntsville, 301 Sparkman Drive, Shelby Center, Huntsville, Alabama 35899, United States