1. Program for Collaborative Research in the Pharmaceutical Sciences and Department of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, University of Illinois at Chicago, Chicago, Illinois 60612, Mycotoxin Research, National Center for Agricultural Utilization Research, USDA, ARS, Peoria, Illinois 61604, and Department of Periodontics, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois 60612