1. Pharmaceutical Chemistry, School of Pharmacy, North-West University, Private Bag X6001, Potchefstroom 2520, South Africa
2. Centre of Excellence for Pharmaceutical Sciences, North-West University, Private Bag X6001, Potchefstroom 2520, South Africa
3. Pharmacology, School of Pharmacy, North-West University, Private Bag X6001, Potchefstroom 2520, South Africa