1. Catalysis
and Peptide Research Unit, School of Health Sciences, University of KwaZulu-Natal, Durban 4001, South Africa
2. Department
of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
3. Chemistry
Department, Faculty of Science, Alexandria University, P.O. Box 426, Ibrahimia, Alexandria 12321, Egypt
4. School
of Chemistry and Physics, University of KwaZulu-Natal, Durban 4001, South Africa
5. Department
of Organic Chemistry, University of Barcelona, 08028-Barcelona, Spain
6. CIBER-BBN, Networking Centre on Bioengineering,
Biomaterials and Nanomedicine, Barcelona
Science Park, 08028-Barcelona, Spain
7. KRISP, College of Health Sciences, University of KwaZulu-Natal, Durban 4001, South Africa