1. Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, Michigan 48103
2. Natural Products Discovery Core, Life Sciences Institute, University of Michigan, Ann Arbor, Michigan 48103
3. Department of Pharmacognosy, Faculty of Pharmacy, Cairo University, Cairo 11562, Egypt
4. Illinois Natural History Survey, University of Illinois Urbana-Champaign, Champaign, Illinois 61820
5. Department of Medicinal Chemistry, College of Pharmacy, University of Michigan, Ann Arbor, Michigan 48103