1. State Key Laboratory of Pulp and Paper Engineering School of Chemistry and Chemical Engineering South China University of Technology Guangzhou 510640 P. R. China
2. Cardiology Department of Guangzhou Panyu Central Hospital Guangzhou University of Chinese Medicine Guangzhou 510006 P. R. China
3. Guangdong Provincial Key Laboratory of New Drug Screening School of Pharmaceutical Sciences Southern Medical University Guangzhou 510515 P. R. China