1. Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong
2. Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
3. Department of Biology and Chemistry, City University of Hong Kong, Hong Kong
4. PearL Materia Medica Development (Shenzhen) Ltd., Shenzhen 518057, China