The present invention relates to a compound represented by the formula (I-2) or a pharmaceutically acceptable acid addition salt thereof.;Ar represents a halogen atom, a cyano group, a nitro group, a carboxyl group, an alkyl group having 1 to 18 carbon atoms, an alkoxy group having 1 to 18 carbon atoms, a cycloalkyl group having 3 to 18 carbon atoms, an aralkyl group having 7 to 18 carbon atoms, An arylalkyloxy group having 7 to 18 carbon atoms, a phenoxy group which may have a substituent, an alkoxycarbonyl group having 2 to 19 carbon atoms which may have a substituent, an aralkyl group having 8 to 19 carbon atoms which may have a substituent A phenyl group, a biphenyl group or a naphthyl group having at least one substituent selected from the group consisting of an alkyloxycarbonyl group. Provided that Ar is substituted with a halogen atom, a cyano group, a nitro group, a carboxyl group, an alkyl group having 1 to 18 carbon atoms, an alkoxycarbonyl group having 2 to 19 carbon atoms which may have a substituent, or an aralkyloxycarbonyl group having 8 to 19 carbon atoms Except for the case of a phenyl group.;The compound or a pharmaceutically acceptable acid addition salt thereof is useful as an antibacterial agent against Helicobacter pylori and a pharmaceutical composition for treating Helicobacter pylol infection.
展开▼
