1. College of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang 550025, P. R. China
2. School of Pharmacy, Zunyi Medical University, Zunyi 563006, P. R. China
3. Key Laboratory of Basic Pharmacology of Ministry of Education and Joint International Research Laboratory of Ethnomedicine of Ministry of Education, Zunyi Medical University, Zunyi 563006, P. R. China