1. Peptide Science Laboratory, School of Chemistry and Physics, University of KwaZulu-Natal, Durban 4001, South Africa
2. KRISP, College of Health Sciences, University of KwaZulu-Natal, Westville, Durban 4001, South Africa
3. Department of Organic Chemistry, University of Barcelona, Martí i Franqués 1-11, Barcelona 08028, Spain
4. CIBER-BBN, Networking Centre on Bioengineering, Biomaterials and Nanomedicine, and IQAC, CSIC, Jordi Girona, Barcelona 08028, Spain