Patent ID: RE41149

Claim:
A stereoisomerically pure N 1 -(1,2-cis-2-halogenocyclopropyl)-substituted pyridonecarboxylic acid derivative represented by the following formula (I): wherein R 1 represents a hydrogen atom, an amino group, a hydroxyl group or a thiol group; R 2 represents a substituent represented by the following formula: wherein R 23 and R 24 together are (CH 2 )j; where j=2 to 5; A represents C—X 3 or a nitrogen atom; X 1 and X 2 , which may be the same or different, each represents a halogen atom; and X 3 represents a halogen atom, an alkyl group of from 1 to 6 carbon atoms, an alkoxyl group from 1 to 6 carbon atoms, a cyano group, a trifluoromethyl group, or a hydrogen atom; or a pharmaceutically acceptable salt thereof.