1. Department of Chemistry, Chulalongkorn University, Bangkok 10330, Thailand
2. Department of Medical Pharmacology and Physiology, University of Missouri, Columbia, Missouri 65211, United States
3. Dalton Cardiovascular Research Center, University of Missouri, Columbia, Missouri 65211, United States
4. Department of Chemistry, University of Missouri, Columbia, Missouri 65211, United States
5. Department of Chemistry, United States Naval Academy, Annapolis, Maryland 21402, United States