1. Department of Pharmaceutical Chemistry Discipline of Pharmaceutical Sciences College of Health Sciences University of KwaZulu-Natal (Westville) Durban 4000 South Africa
2. School of Chemistry and Physics University of KwaZulu Natal Westville P/Bag X54001 Durban 4000 South Africa
3. Department of Chemistry School of Science GITAM Deemed to be University Hyderabad Telangana 502329 India.