1. Centre for Drug Research, Universiti Sains Malaysia, Minden 11800, Penang, Malaysia
2. School of Pharmacy, Monash University Malaysia, Bandar Sunway 47500, Selangor, Malaysia
3. Department of Drug Discovery and Biomedical Sciences, College of Pharmacy, University of South Carolina, Columbia, SC 29201, USA
4. Chemistry Section, School of Distance Education, Universiti Sains Malaysia, Minden 11800, Penang, Malaysia
5. Department of Medicinal Chemistry, College of Pharmacy, University of Florida, Gainesville, FL 32610, USA
6. Discipline of Pharmacology, School of Pharmaceutical Sciences, Universiti Sains Malaysia, Minden 11800, Penang, Malaysia