1. Pharmaceutical Technologies, Future Production: Chemicals, Council for Scientific and Industrial Research (CSIR), Meiring Naude Road, Brummeria, Pretoria, South Africa
2. Department of Chemistry, Faculty of Natural and Agricultural Sciences, University of Pretoria, Lynnwood Road, Pretoria, South Africa
3. Department of Chemistry and Polymer Science, Stellenbosch University, Matieland, Stellenbosch, 7600, South Africa