1. Catalysis and Peptide Research Unit, School of Health Sciences, University of KwaZulu-Natal, Durban, South Africa
2. Department of Chemistry, University of Florida, Gainesville, Florida, USA
3. Department of Chemistry, University of Zululand, KwaDlangezwa, South Africa
4. School of Chemistry and Physics, University of KwaZulu-Natal, Durban, South Africa