Synthesis and antibacterial activities of novel dihydrooxazine and dihydrothiazine ring-fused tricyclic quinolonecarboxylic acids: 9-Fluoro-3-methylene-10-(4-methylpiperazin-1-yl)-7-oxo-2,3-dihydro-7h-pyrido[1,2,3-de][1,4]benzoxazine-6-carboxylic acid and its 1-thia congener

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