1. College of Food Engineering, Ludong University, Yantai, P. R. China
2. College of Chemistry and Materials Science, Ludong University, Yantai, P. R. China
3. Department of Natural Medicinal Chemistry, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, P. R. China
4. College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai, China