1. Key Laboratory of Nonferrous Metal Chemistry
and Resources Utilization
of Gansu Province, State Key Laboratory of Applied Organic Chemistry,
College of Chemistry and Chemical Engineering, ‡The Research Center of Biomedical
Nanotechnology, and §Key Lab of Preclinical Study for New Drugs of Gansu Province, School
of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, P. R. China