| abstract |
(57) [Problem] To provide a quinolone antibacterial agent having strong antibacterial activity against Gram-positive bacteria, Gram-negative bacteria or anaerobic bacteria. SOLUTION: The following formula (I): The compound represented by (I) or a pharmaceutically acceptable salt thereof. (Wherein, R 1 represents a hydrogen atom or a carboxyl protecting group, R 2 represents a hydrogen atom or a halogen atom, R 3 represents a 6-membered aromatic substituent selected from a pyridinyl or phenyl group, and a hydrogen atom, a lower alkyl group, a lower alkoxy group, a nitro group, a cyano group, an amino group, an acyl group, a carbamoyl group, It contains a substituent selected from the group consisting of a ureido group, a halogen atom, a hydroxyl group and a carboxyl group. ) |