1. Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
2. National Center for Natural Products Research, School of Pharmacy, University of Mississippi, University, MS, USA
3. Division of Pharmacognosy, Department of BioMolecular Sciences, School of Pharmacy, University of Mississippi, University, MS, USA
4. Department of Chemistry, Faculty of Science, Universiti Malaya, Kuala Lumpur, Malaysia
5. Department of Nutrition and Dietetics, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia