Antibacterial agent 202 (compound 45c) is a low cytotoxic bacterial inhibitor with good activity against Gram-negative bacteria, including Escherichia coli, Klebsiella pneumonia, especially Pseudomonas aeruginosa, (MIC (minimum inhibitory concentration)=7.8-31.25 μM). Antibacterial agent 202 can exert antibacterial activity by destroying the integrity of cell membranes and can be used in the research of bacterial infections^[1].