1. Mass Spectrometry Laboratory and Centre of Theoretical and Computational Chemistry, Department of Chemistry, University of Oslo, POB 1033 Blindern, NO-0315 Oslo, Norway
2. Department of Chemistry, Atmospheric Science, University of Gothenburg, SE-412 96 Göteborg, Sweden
3. AstraZeneca R&D Mölndal, Pepparedsleden 1, SE-431 83 Mölndal, Sweden