1. Natural Products Research Group, School of Chemistry, University of KwaZulu-Natal, Durban 4041, South Africa
2. Institute of Traditional Medicine, Muhimbili University of Health and Allied Sciences, P.O. Box 65001, DSM, Tanzania
3. Faculty of Health and Medical Sciences, University of Surrey, Guildford, Surrey, GU2 7XH, UK
4. Ethnobotany Unit, South African National Biodiversity Institute, P.O. Box 52099, Berea Road 4007, Durban, South Africa