1. State Key Laboratory of Anti-Infective Drug Development (No. 2015DQ780357), Sunshine Lake Pharma Co., Ltd, Dongguan 523871, P. R. China
2. Department of Process Research and Development, HEC Pharm Group, Dongguan 523871, P. R. China
3. School of Pharmacy, Xiangnan University, Chenzhou 423000, Hunan, P. R. China