1. Department of Chemistry, Faculty of Science, Universiti Malaya, Kuala Lumpur, Malaysia
2. Centre for Natural Products Research and Drug Discovery (CENAR), Universiti Malaya, Kuala Lumpur, Malaysia
3. School of Pharmacy, Monash University Malaysia, Subang Jaya, Selangor, Malaysia
4. Department of Pharmacy, Faculty of Mathematics and Natural Sciences, Tadulako University, Palu, Indonesia
5. Department of Pharmaceutical Science, Faculty of Pharmacy, Airlangga University, Surabaya, Indonesia
6. Chemistry Division, Centre for Foundation Studies in Science, Universiti Malaya, Kuala Lumpur, Malaysia