1. Chongqing Key Laboratory of Biochemistry and Molecular Pharmacology , School of Pharmacy, Chongqing Medical University , Chongqing 400016 , P. R. China
2. Chongqing Engineering Research Center of Pharmaceutical Sciences , School of Pharmacy, Chongqing Medical and Pharmaceutical College , Chongqing 401331 , P. R. China
3. School of Pharmacy, Chongqing Medical University , Chongqing 400016 , P. R. China