School of pharmaceutical sciences;
Research laboratory of pharmaceutical chemistry and biomaterials;
Chongqing Medical University;
Chongqing 400016;
P.R. China;
Chongqing Institute For Drug Control;
Chongqing 400015;
P.R. China;
College of Chemistry and Chemical Engineering;
Chongqing University;
Chongqing 400044;
P.R. China;