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