a
Division of Bioorganic Chemistry, School of Pharmacy, Saarland University, D-66123 Saarbrücken, Germany
b
Department of Chemical Biology, Helmholtz Centre for Infection Research, Inhoffenstrasse 7, D-38124 Braunschweig, Germany
E-mail: florenz.sasse@helmholtz-hzi.de
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Fax: +49 531-6181-3499