The present invention discloses a compound represented by the followingformula (IA) or apharmaceutically acceptable salt thereof(see formula IA)wherein n represents 0 to 2； A represents an arylene group or a heteroarylenegroup； Grepresents a single bond, an oxygen atom or -CH2-； E represents a nitrogen-containingnon-aromatic heterocycle； R1 represents an alkoxy group, an alkoxy alkoxygroup or the like；R2 represents a hydrogen atom, a halogen atom, a hydroxyl group, an alkylgroup, a hydroxyalkyl group, a nitrogen-containing non-aromatic heterocyclic group or thelike； R3 representsa hydrogen atom, an alkyl group, an alkoxy group or the like； and R4represents a C1-6 alkylgroup, with the proviso that when E represents an azetidine ring and R2 or R3is present on anitrogen atom on the azetidine ring, the R2 or R3 does not represent ahydrogen atom.
