1. Department of Chemistry, State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, P. R. China.
2. Chemistry and Chemical Engineering Guangdong Laboratory, Shantou, Guangdong Province 515063, P. R. China.
3. Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong SAR, P. R. China.