1. Department of Chemistry, University of Cape Town, Rondebosch 7701, South Africa
2. Division of Pharmacology, University of Cape Town, Observatory 7925, South Africa
3. Department of Medicine, San Francisco General Hospital, University of California at San Francisco, San Francisco, California 94143, United States
4. Centre for Drug Candidate Optimisation, Monash Institute of Pharmaceutical Sciences, Monash University (Parkville Campus), 381 Royal Parade, Parkville, Victoria 3052, Australia
5. Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Rondebosch 7701, South Africa