1. National
Glycoengineering Research Center, School of Pharmaceutical Science, Shandong University, Jinan 250012, China
2. College
of Pharmacy, Nankai University, Tianjin 300071, China
3. Department
of Chemistry, University of California, Davis, California 95616, United States
4. Key
Laboratory of Chemical Biology (Ministry of Education), Shandong University, Jinan 250012, China