HETEROCYCLIC SPIRO DERIVATIVES

摘要

The present invention provides an antibacterial compound useful as medicines, animal drugs, fisheries drugs or antibacterial preservatives and to an antibacterial agent or preparation which contains the same, more particularly a compound which possesses high safety and excellent activity against a broad range of bacterial species including quinolone-resistant strains. A quinolone derivative of the following formula (I) which has a group derived from the heterocyclic spiro-compound at the 7-positioned R<2> and the halogenocyclopropyl group at the N1-position, prefereably a compound of pure isomer, and an antibacterial agent containing the derivative compound. <CHEM>