1. School of Pharmacy, International Cancer Center, Shenzhen University Medical School, Shenzhen University, Shenzhen, Guangdong 518055, People's Republic of China
2. State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin, Guangxi 541006, People's Republic of China
3. Department of Chemistry, City University of Hong Kong, 83 Tat Chee Ave, Kowloon Tong, Hong Kong SAR 999077, People's Republic of China