| abstract |
Pyridonecarboxylic acid derivatives of the following formula.wherein R is hydrogen atom or lower alkyl group, R<sup>1</sup> is lower alkyl group, cycloalkyl group or haloalkyl group, Y is hydrogen atom or halogen atom, or Y and R<sup>1</sup> arewhich work together, R<sup>2</sup> is hydrogen atom, lower alkyl group, alkoxycarbonyl group or acyl group and n is 0 or 1; the hydrates and pharmaceutically acceptable salts thereof are useful as antibacterial agents. |