1. Department
of Chemistry, University of Nairobi, P.O. Box 30197-00100, Nairobi, Kenya
2. Department
of Chemistry and Molecular Biology, University of Gothenburg, SE-412 96 Gothenburg, Sweden
3. Department
of Chemistry, Jimma University, P.O. Box 378, Jimma, Ethiopia
4. Department
of Chemistry, Nanoscience Center, University of Jyvaskyla, P.O. Box 35, FI-40014 Jyvaskyla, Finland
5. Sahlgrenska
Cancer Centre, University of Gothenburg, Gothenburg SE-405 30, Sweden
6. Swedish
NMR
Centre, University of Gothenburg, Gothenburg SE-405 30, Sweden