1. Department of Pharmacy, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
2. Center of Natural Products Research and Drug Discovery (CENAR), University of Malaya, Kuala Lumpur, Malaysia
3. Department of Pharmacognosy, Faculty of pharmacy, Sana’a University, Sanaa, Yemen
4. Department of Pharmacognosy, Faculty of Clinical Pharmacy, Albaha University, Albaha, Kingdom of Saudia Arabia
5. Drug Design and Development Research Group (DDDRG), University of Malaya, Kuala Lumpur, Malaysia
6. Chemistry Department, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia