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Quinolones containing 3-carboxylic benzopyridone skeletons are an important kind of synthetic antibacterial agents as they are generally well tolerated with good treatment effectiveness,broad antibacterial spectrum and favorable pharmacokinetic characteristics.Since the first quinolone drug was discovered in 1960s,the related structural modifications based on 3-carboxylic benzopyridone skeletons have become an extremely attractive topic in antibacterial field,and much effort has been focusing on this topic.