[1
]Key Laboratory of Drug-Targeting and Drug Delivery System of the Education MinistrySichuan
Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug
Precision Industrial TechnologyWest China School of PharmacySichuan University Chengdu
610041 P. R. China
[2
]School of Pharmaceutic ScienceChongqing University Chongqing 401331 P. R. China