Antibiofilm agent-6 (Compound 26c) is a quorum sensing inhibitor with antibiofilm properties, effectively reducing the fluorescence intensity of PAO1-lasB-gfp and PAO1-pqsA-gfp in a concentration-dependent manner. It suppresses the production of pyocyanin and rhamnolipids and enhances the efficacy of ciprofloxacin in eradicating viable bacteria in a Pseudomonas aeruginosa (P. aeruginosa PAO1) infected mouse model.