1. National Research Centre for Carbohydrate Synthesis, Jiangxi Normal University, Nanchang 330022, P. R. China
2. College of Chemistry and Civil Engineering, Shaoguan University, Shaoguan 512005, Guangdong Province, P. R. China
3. Key Laboratory of Chemical Biology, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, Jiangxi 330022, P.R. China