1. Department of Chemistry, University of Cape Town, Rondebosch, 7701 Cape Town, South Africa
2. Division of Clinical Pharmacology, Department of Medicine, University of Cape Town, Observatory, 7925 Cape Town, South Africa
3. South African Medical Research Council Drug Discovery and Development Research Unit, Holistic Drug Discovery and Development (H3D) Centre, Rondebosch, 7701 Cape Town, South Africa
4. Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Rondebosch, 7701 Cape Town, South Africa