a
College of Chemistry and Molecular Sciences, Key Laboratory of Biomedical Polymers of Ministry of Education, State Key Laboratory of Virology, Wuhan University, Hubei, Wuhan, P. R. China
E-mail: xzhou@whu.edu.cn
;
Fax: +86-27-87336380
;
Tel: +86-27-61056559
b
State Key Laboratory of Natural and Biomimetic Drugs, Beijing University, P. R. China