1. Department
of Chemistry, University of Nairobi, POB 30197-00100, Nairobi, Kenya
2. Department
of Chemistry and Molecular Biology, University of Gothenburg, SE-41296 Gothenburg, Sweden
3. Office
of the Vice Chancellor, Kyambogo University, POB 1, Kyambogo-Kampala, Uganda
4. Swedish
NMR Centre, University of Gothenburg, SE-40530 Gothenburg, Sweden