Seventeen novel 2,5‐disubstituted benzimidazole derivatives were designed, synthesized and evaluated for their antibacterial activities. The tested compounds B1–B4 and C2–C6 exhibited not only good antifungal activity but also favorable broad‐spectrum antibacterial activity. Also, the lowest MIC of antibacterial and antifungal activity was 2 μg/mL and 4 μg/mL, respectively. It suggested that the structure of compound including the different substituent and its sites directly affected the efficacy of the synthesized compounds.

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