Antibacterial agent 128 is a siderophore analog-Ciprofloxacin ( Ciprofloxacin ) conjugate with a cleavable linker. Antibacterial agent 128 shows antibiotic activities against P. aeruginosa (MIC values of 0.25-64 μg/mL) and B. pseudomallei (MIC values of 1-32 μg/mL).