Monocyclic pyridine derivative

A compound represented by the following formula (I) or a pharmaceutically acceptable salt thereof:

• wherein
• n represents 0 to 2;
• A represents a C6-10 arylene group;
• G represents a single bond, an oxygen atom or —CH2—;
• E represents a C3-5 nitrogen-containing non-aromatic heterocycle;
• R1 represents a C1-6 alkoxy group optionally substituted by 1 to 3 halogen atoms, or a C1-6 alkoxy C1-6 alkoxy group optionally substituted by 1 to 3 halogen atoms;
• R2 represents a hydrogen atom, a halogen atom, a hydroxyl group, a C1-6 alkyl group optionally substituted by 1 to 3 halogen atoms, a hydroxy C1-6 alkyl group optionally substituted by 1 to 3 halogen atoms, or a C3-5 nitrogen-containing non-aromatic heterocyclic group;
• and
• R3 represents a hydrogen atom, a C1-6 alkyl group optionally substituted by 1 to 3 halogen atoms, or a C1-6 alkoxy group optionally substituted by 1 to 3 halogen atoms, with the proviso that when E represents an azetidine ring and R2 or R3 is present on a nitrogen atom on the azetidine ring, the R2 or R3 does not represent a hydrogen atom.