1. School of Chemistry and Physics Pietermaritzburg CampusUniversity of KwaZulu-Natal Private Bag X01 Scottsville 3209 South Africa
2. Rhodes University Grahamstown 6140 South Africa
3. Drug Discovery and Development Centre (H3D) South African Medical Research Council Drug Discovery and Development Research Unit Department of Chemistry and Institute of Infectious Disease & Molecular MedicineUniversity of Cape Town Rondebosch 7701 South Africa