1. National Center for Natural Products Research, School of Pharmacy, The University of Mississippi, University, Mississippi 38677, United States
2. Natural Products Utilization Research Unit, Agricultural Research Service, United States Department of Agriculture, University, Mississippi 38677, United States
3. Department of Biomolecular Sciences, School of Pharmacy, The University of Mississippi, University, Mississippi 38677, United States
4. Plant Genetic Resources Unit, USDA-ARS, 1109 Experiment Street, Griffin, Georgia 30223, United States