1. Department of phytochemistry, China Pharmaceutical University, Nanjing, 210009, P.R. China
2. College of Pharmacy, Institute of Traditional Chinese Medicine & Natural Products, Jinan University, Guangzhou, 510632, P.R. China
3. Guangdong Province Key Laboratory of Pharmacodynamic Constituents of TCM and New Drugs Research, Jinan University, Guangzhou, 510632, P.R. China