1. College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, P. R. China, Department of Nutrition, Faculty of Health and Welfare, Okayama Prefectural University, Kuboki 111, Soja, Okayama 7191197, Japan, and Research Institute for Molecular Pharmacology and Therapeutics, Central South University, Changsha, Hunan 410083, P.R. China