1. Natural Products Discovery Group, Southern School of Pharmacy, Mercer University, Atlanta, Georgia 30341, National Center for the Development of Natural Products and Department of Pharmacognosy, School of Pharmacy, University of Mississippi, University, Mississippi 38677, American Type Culture Collection, Rockville, Maryland 20852, College of Pharmacy, University of Georgia, Athens, Georgia 30602, and HortResearch, Ruakura Research Centre, Ruakura, Hamilton, New Zealand