1. Abbott Laboratories, Abbott Park, IL 60064
2. Department of Chemistry, Purdue University, West Lafayette, IN 47907
3. Current address: Dow Chemical Company, Building 768, Midland, MI 48667
4. Current address: Alchemie Research Center, P.O. Box 155, Thane Belapur Road, Thane 400 601, Maharashtra, India
5. Southern Regional Research Center, Agricultural Research Service, U.S. Department of Agriculture, New Orleans, LA 70179