* Corresponding authors

^a Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, Hong Kong, China
E-mail: edmondma@hkbu.edu.hk

^b Department of Chemistry and the State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, China
E-mail: pchiu@hku.hk

^c State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macao, China
E-mail: duncanleung@umac.mo

^d Department of Pharmacology, Yale University School of Medicine, New Haven, CT 06520, USA
E-mail: yccheng@yale.edu