1. Department of ChemistryUniversity of Cape TownPrivate Bag, Rondebosch7701Cape TownSouth Africa
2. Division of PharmacologyDepartment of MedicineUniversity of Cape TownGroote Schuur HospitalK45, OMB, Observatory7925Cape TownSouth Africa
3. Institute of Infectious Disease and Molecular MedicineUniversity of Cape TownRondebosch7701Cape TownSouth Africa
4. South African Medical Research Council Drug Discovery & Development Research UnitUniversity of Cape TownRondebosch7701Cape TownSouth Africa