1. Department of Chemistry, Faculty of Science Rhodes University Makhanda South Africa
2. Centre of Excellence for Pharmaceutical Sciences North‐West University Potchefstroom South Africa
3. Centre for Chemico‐ and Biomedicinal Research Rhodes University Makhanda South Africa
4. Department of Biochemistry and Microbiology, Faculty of Science Rhodes University Makhanda South Africa
5. Division of Pharmaceutical Chemistry, Faculty of Pharmacy Rhodes University Makhanda South Africa