1. National Glycoengineering Research Center; Shandong Provincial Key Lab of Carbohydrate Chemistry; and State Key Lab of Microbial Technology; Shandong University; 250100 Jinan, Shandong P. R. China
2. Department of Chemistry; Georgia State University; 30303 Atlanta Georgia USA
3. Department of Chemistry; University of California, Davis; One Shields Avenue 95616 Davis CA USA