1. National Glycoengineering Research Center, Shandong Provincial Key Laboratory of Carbohydrate Chemistry and Glycobiology, School of Pharmaceutical Sciences, Shandong University, Wenhua West Road #44, Jinan, Shandong 250012, China
2. Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States
3. Department of Chemistry, University of Konstanz, D-78457 Konstanz, Germany