Antibacterialagent 274 (Compound 18b) is an antibacterial agent that targets bacterial cell membranes, exhibiting a minimum inhibitory concentration (MIC) of 8 μg/mL against Acinetobacter baumannii ATCC 17978. It functions by disrupting membrane integrity, causing intracellular accumulation of ROS, which leads to DNA and protein leakage, thereby exerting its antibacterial effects. Antibacterialagent 274 is applicable in research on infections caused by Gram-negative bacteria.