1. Department of Chemistry Faculty of Natural Sciences and Institute of Chemical Biology (ICB), Imperial College London South Kensington Campus London SW7 2AZ UK
2. MRC Centre for Molecular Bacteriology and Infection, Department of Life Sciences, Faculty of Natural Sciences Imperial College London London SW7 2AZ UK
3. Department of Mathematics Imperial College London London SW7 2AZ UK
4. Bruker Daltonik GmbH Bremen 28359 Germany
5. Syngenta Group, Bioscience, Jealott's Hill Research Station, Bracknell RG42 6EY UK