1. Laboratories for Biomembrane Research and Biotechnology, Department of Biochemistry College of Medicine, University of Ibadan Ibadan Nigeria
2. Natural Products Research Laboratory School of Chemistry and Physics University of Kwazulu‐Natal Durban South Africa
3. Department of Chemistry University of Pretoria Pretoria South Africa
4. Department of Pharmaceutical Chemistry Obafemi Awolowo University Ile‐Ife Nigeria