1. National Center for Natural Products Research, Research Institute of Pharmaceutical Sciences, School of Pharmacy, University of Mississippi, University, Mississippi 38677, United States
2. Department of Pharmaceutical Sciences and SAMRC Herbal Drugs Research Unit, Tshwane University of Technology, Pretoria 0001, South Africa
3. Department of Biomolecular Sciences, School of Pharmacy, University of Mississippi, University, Mississippi 38677, United States