1. Key Laboratory of Drug-Targeting and Drug Delivery System of Education Ministry, Department of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, No. 17, Third Section, South Renmin Road, Chengdu, Sichuan 610041, P. R. China
2. Department of Pharmacy, Taihe Hospital, Hubei University of Medicine, No. 32 South Renmin Road, Shiyan, Hubei 442000, China