1. College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
2. State Key Laboratory of Anti-Infective Drug Development, Sunshine Lake Pharma Co., Ltd., Dongguan 523871, P. R. China
3. HEC Research and Development Center, HEC Pharm Group, Dongguan 523871, P. R. China
4. School of Pharmacy, Xiangnan University, Chenzhou 423000, Hunan, P. R. China