Ethyl 1-(6-Amino-3,5-difluoropyridin-2-yl)-8-chloro-6,7-difluoro-4-oxo-1,4-dihydroquinoline-3-carboxylate is a useful reactant in preparation and study of antimycobacterial and antibacterial ctivity of (aminodifluoropyridinyl)fluoroquinolone derivatives containing oxime functional moiety.