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Ridinilazole (SMT19969) is a novel narrow-spectrum nonabsorbable antibiotic. Ridinilazole showed potent inhibition of C. difficile (MIC90=0.125 mg/L) and was markedly more active than either metronidazole (MIC90 = 8 mg/L) or vancomycin (MIC90 = 2 mg/L).