1. Colgate-Palmolive Company, 909 River Road Piscataway, New Jersey 08854, Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, New Jersey 08854, Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, Illinois 60115, and State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China