1. Department of Chemistry and Molecular Biology; University of Gothenburg; SE-412 96 Gothenburg Sweden
2. Department of Infectious Disease/Clinical Bacteriology; University of Gothenburg; SE-412 96 Gothenburg Sweden
3. AstraZeneca R&D Mölndal; Mölndal Sweden
4. Metabolic Research Group, School of Environmental and Life Sciences; The University of Newcastle; Callaghan NSW 2287 Australia