1. Department of Chemistry, University of Cape Town, Rondebosch 7701, South Africa
2. Drug Discovery and Development Centre (H3D), Division of Clinical Pharmacology, Department of Medicine, University of Cape Town, Observatory 7925, South Africa
3. South African Medical Research Council Drug Discovery and Development Research Unit, Department of Chemistry, University of Cape Town, Rondebosch 7701, South Africa
4. Swiss Tropical and Public Health Institute, Socinstrasse 57, Basel 4002, Switzerland
5. University of Basel, Basel 4003, Switzerland
6. Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Rondebosch 7701, South Africa