1. School of Pharmaceutical Sciences, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, and Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education), Tsinghua University, Beijing 100084, P. R. China
2. Medical College, Qinghai University, Qinghai 810001, P. R. China
3. Crystal Pharmatech Co., Ltd., B4-101, Biobay, 218 Xinghu Street, Suzhou Industrial
Park, Jiangsu 215123, P. R. China