1. Department of Chemistry, University of Zambia, Great East Road Campus, P.O. Box 32379, Lusaka, Zambia
2. Department of Chemistry, University of Cape Town, Rondebosch 7701, South Africa
3. Department of Microbiology and Immunology, Columbia University, 701 West 168th Street, New York, New York 10032, United States
4. Drug Discovery and Development Centre (H3D), Department of Chemistry, University of Cape Town, Rondebosch 7701, South Africa
5. Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Rondebosch 7701, South Africa
6. South African Medical Research Council Drug Discovery and Development Research Unit, University of Cape Town, Rondebosch 7701, South Africa