1. Laboratory of Mathematical Chemistry, University “Prof. As. Zlatarov”, 8010 Bourgas, Bulgaria, Human & Environmental Safety, The Procter & Gamble Company, MVL, Cincinnati, Ohio 45239-8707, and TSCA Interagency Testing Committee (ITC), Office of Pollution Prevention and Toxics (7401), U.S. Environmental Protection Agency, Washington, D.C. 20460