1. Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, TU Dortmund, Dortmund, Germany
2. Department of Pharmacognosy, Faculty of Pharmacy, Obafemi Awolowo University, Ile-Ife, Nigeria
3. Department of Chemistry, Faculty of Sciences, Egerton University, Egerton, Kenya
4. Department of Chemistry, Addis Ababa University, Addis Ababa, Ethiopia