1. Department of Chemistry and Biochemistry, College of Arts and Sciences, The Ohio State University, Columbus, Ohio 43210, United States
2. Oak Ridge Institute for Science and Education, 1299 Bethel Valley Road, Oak Ridge, Tennessee 37830, United States
3. U.S. Army Medical Research Institute of Chemical Defense, 8350 Ricketts Point Road, Aberdeen Proving Ground, Maryland 21010, United States
4. Department of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, The Ohio State University, Columbus, Ohio 43210, United States