1. State Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China), School of Chemistry and Pharmaceutical Sciences of Guangxi Normal University, Guilin 541004, China
2. School of Pharmacy, Guilin Medical University, Guilin 541004, China
3. Jiangsu Province Hi-Tech Key Laboratory for Biomedical Research and School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China