a
College of Science, Northwest A&F University, Yangling, Shaanxi, P. R. China
b
Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China
E-mail: fuhua@mail.tsinghua.edu.cn
;
Fax: +86 10-62781695
c
Key Laboratory of Chemical Biology (Guangdong Province), Graduate School of Shenzhen, Tsinghua University, Shenzhen 518057, P. R. China