1. Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
2. Department of Applied Chemistry, National Chiayi University, Chiayi 60004, Taiwan
3. Department of Chemistry, City University of Hong Kong, Hong Kong SAR, China
4. Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung 80708, Taiwan