1. Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, Johor Bahru, Johor, Malaysia
2. Natural Product and Drug Discovery, Malaysian Institute of Pharmaceuticals and Nutraceuticals, Gelugor, Pulau Pinang, Malaysia
3. Department of Biotechnology and Medical Engineering, Faculty of Biosciences and Medical Engineering, Universiti Teknologi Malaysia, Johor Bahru, Johor, Malaysia