1. National Glycoengineering Research Center, Shandong Technology Innovation Center of Carbohydrate, NMPA Key Laboratory for Quality Research and Evaluation of Carbohydrate Based Medicine, Key Laboratory of Chemical Biology (Ministry of Education), Shandong University, Shandong 266237, China
2. Division of Molecular Catalysis and Synthesis, Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou 450000, China
3. Department of Chemistry, University of Konstanz, Konstanz D-78457, Germany