1. Chemistry Department, College of Natural and Applied Sciences, University of Dar es Salaam, P.O. Box 35061, Dar es Salaam, Tanzania
2. Department of Chemistry and Molecular Biology, University of Gothenburg, SE-412 96 Gothenburg, Sweden
3. Department of Chemistry − BMC, Uppsala University, SE-751 23 Uppsala, Sweden
4. Discovery Biology, Griffith Institute for Drug Discovery, Griffith University, Nathan Q1d 4111, Australia
5. Department of Biochemistry, McGill University, Montreal, QC H3G 1Y6, Canada