Alan R. Katritzky1, Zhizhen Huang, Yunfeng Fang, Indra Prakash. 1. Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, and Monsanto, Nutrition and Consumer Sector, 601 East Kensington Road, Mt. Prospect, Illinois 60056-1300.