1. School of Pharmaceutical Science, Kunming Medical University, 1168 Chunrong West Road, Chenggong District, Kunming, Yunnan 650500, P. R. China
2. Yunnan Key Laboratory of Pharmacology for Natural Products, Kunming Medical University, 1168 Chunrong West Road, Chenggong District, Kunming, Yunnan 650500, P. R. China