1United States Department of Agriculture, Agricultural Research Service, Natural Products Utilization Research Unit, National Center for Natural Products Research, Post Office Box 1848, Mississippi 38677, USA, E-mail: kevin.schrader@ars.usda.gov
2Departments of Pharmacognosy, School of Pharmacy, University of Mississippi, Mississippi 38677, USA, E-mail: kevin.schrader@ars.usda.gov
3Pharmacology, Chemistry and Biochemistry Department, School of Pharmacy, University of Mississippi, University, Mississippi 38677, USA, E-mail: kevin.schrader@ars.usda.gov
4Ironstone Separations, Inc., 147 County Road 245, Etta, Mississippi 38627, USA, E-mail: kevin.schrader@ars.usda.gov
5Department of Chemistry of Natural Compounds, National Research Center, Dokki 12622, Cairo, Egypt, E-mail: kevin.schrader@ars.usda.gov