4-Quinolone-3-carboxylic acid

4-Quinolone-3-carboxylic acid is a core structure in medicinal chemistry, mainly used as a scaffold for potent antibacterial drugs (fluoroquinolones like Ciprofloxacin), but also explored for diverse “non-classical” uses including anti-cancer (antitumor), anti-HIV, anti-parasitic, anti-inflammatory, and cannabinoid receptor modulation (CB2), acting by targeting bacterial topoisomerases or offering broad biological activity against various diseases.