Cefiderocol, also known as S-649266, is a potent siderophore cephalosporin antibiotic with a catechol moiety on the 3-position side chain. S-649266 shows potent in vitro activity against the non-fermenting Gram-negative bacteria Acinetobacter baumannii, Pseudomonas aeruginosa and Stenotrophomonas maltophilia, including MDR strains such as carbapenem-resistant A. baumannii and metallo-β-lactamase-producing P. aeruginosa. S-649266 showed potent in vitro activities against A. baumannii producing carbapenemases such as OXA-type β-lactamases, and P. aeruginosa producing metallo-β-lactamases such as IMP type and VIM type.
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