1. Catalysis and Peptide Research Unit, University of KwaZulu-Natal, Westville Campus, Durban 3629, South Africa
2. Department of Pharmaceutical Science, University of KwaZulu-Natal, Westville Campus, Durban 3629, South Africa
3. Department of Criminology, University of KwaZulu-Natal, Durban 4041, South Africa
4. Department of Chemistry, University of Zululand, Richards Bay 3900, South Africa