1 Astex 436 Cambridge Science Park Cambridge CB4 0QA UK David.Rees@astx.com.
2 Helmholtz Institute for Pharmaceutical Research Saarland - Helmholtz Centre for Infection Research and Department for Pharmacy, Saarland University Campus E8.1 66125 Saarbrücken Germany Anna.Hirsch@helmholtz-hips.de.
3 Frontier Medicines 151 Oyster Point Blvd South San Francisco 94080 USA daniel.erlanson@frontiermeds.com.