1. Medicinal Chemistry and Pharmacognosy Department, Faculty of Pharmacy, Jordan University of Science and Technology, P.O. Box 3030, Irbid, 22110, Jordan, Natural Products Laboratory, Research Triangle Institute, P.O. Box 12194, Research Triangle Park, North Carolina 27709-2194, Faculty of Pharmacy, University of Applied Sciences, Shafa-Badran, Amman, Jordan, and Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0406