1. Catalysis and Peptide Research Unit, University of KwaZulu Natal, Durban 4001, South Africa
2. Science for Life Laboratory, Drug Discovery & Development Platform & Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm 171 65, Sweden
3. School of Chemistry and Physics, University of KwaZulu Natal, Durban 4001, South Africa
4. Department of Chemistry, University of Zululand, Private Bag X1001, KwaDlangezwa 3886, South Africa