1. Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
2. US Army DEVCOM-CBC, FCDD-CBR-CC E3400, 5183 Blackhawk Rd. Aberdeen Proving Ground, Aberdeen, Maryland 21010, United States
3. Department of Biochemistry & Biophysics, Texas A&M University, College Station, Texas 7784, United States