Quinolonecarboxylic acid derivatives or their salts.

摘要

Quinolonecaboxylic acid derivatives represented by general formula (I) or salts of these. Preferred are compounds wherein R<2> represents optionally substituted cycloalkyl, R<3> represents at least one member selected among hydrogen, halogeno, optionally substituted lower alkyl or alkoxy, and optionally protected hydroxy or amino, R<4> represents hydrogen or optionally substituted lower alkyl, R<5> and R<6> each represents hydrogen, and A represents C-Y (where Y represents halogeno, lower alkyl or alkoxy each optionally substituted by halogeno, or optionally protected hydroxy).