Disclosed is a compound represented by formula (IA) or a pharmaceutically acceptable salt thereof. In the formula, n represents 0 to 2, A represents an arylene group or a heteroarylene group, G represents a single bond, an oxygen atom or -CH2-, E represents a nitrogenated non-aromatic hetero ring, R1 represents an alkoxy group, an alkoxyalkoxy group or the like, R2 represents a hydrogen atom, a halogen atom, a hydroxy group, an alkyl group, a hydroxyalkyl group, a nitrogenated non-aromatic heterocyclic group or the like, R3 represents a hydrogen atom, an alkyl group, an alkoxy group or the like, and R4 represents a C1-6 alkyl group, wherein when E is an azetidine ring and R2 or R3 exists on a nitrogen atom in the azetidine ring, R2 or R3 is not a hydrogen atom.
