a
National Glycoengineering Research Center, School of Pharmaceutical Science, Shandong University, Jinan 250012, China
E-mail: hzcao@sdu.edu.cn
;
Fax: +86 531 88363002+86 531 88382548
;
Tel: +86 531 88382235+86 531 88382589
b
Department of Chemistry, University of California, One Shields Avenue, Davis, USA
E-mail: chen@chem.ucdavis.edu
;
Fax: +1 530 7528995
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Tel: +1 530 7546037
c
Key Laboratory of Chemical Biology (Ministry of Education), Shandong University, Jinan 250012, China
d
State Key Laboratory of Bio-organic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China