1. Department of Chemistry, University of Kentucky, Lexington, KY, USA
2. Sanders-Brown Center on Aging, University of Kentucky, Lexington, KY, USA
3. Universisty of Kentucky Mass Spectrometry Center, Lexington, KY, USA
4. Department of Biochemistry, University of Kentucky, Lexington, KY, USA
5. Department of Pharmacology, University of Kentucky, Lexington, KY, USA