1. U.S. Department of Agriculture, ARS, NPUPU, The University of Mississippi, University, Mississippi 38677; Department of Pharmacognosy, Faculty of Pharmacy, Anadolu University, 26470 Eskisehir, Turkey; Department of Biology, Faculty of Science and Letters, Gazi University, 06500 Ankara, Turkey; and National Center for Natural Products Research, Research Institute of Pharmaceutical Sciences, School of Pharmacy, The University of Mississippi, University, Mississippi 38677