1. Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Observatory, Cape Town 7925, South Africa
2. Department of Integrative Biomedical Sciences, University of Cape Town, Observatory, Cape Town 7925, South Africa
3. Department of Biology and Biochemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K.
4. Drug Discovery and Development Centre (H3D), University of Cape Town, Rondebosch, Cape Town 7701, South Africa
5. Department of Chemistry, University of Cape Town, Rondebosch, Cape Town 7701, South Africa
6. South African Medical Research Council Drug Discovery and Development Research Unit, University of Cape Town, Rondebosch, Cape Town 7701, South Africa