1. Department of Chemistry, University of Cape Town, Rondebosch, Cape Town 7700, South Africa
2. International Centre for Genetic Engineering and Biotechnology, Observatory, Cape Town 7925, South Africa
3. Department of Integrative Biomedical Sciences, University of Cape Town, Observatory, Cape Town 7925, South Africa
4. Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Observatory, Cape Town 7925, South Africa
5. SA-MRC-UCT Gynaecological Cancer Research Centre, University of Cape Town, Cape Town 7925, South Africa
6. Department of Chemistry and Polymer Science, Stellenbosch University, Matieland 7600, South Africa