A compound represented by the formula: wherein A is CH or N; R 1 is a C 1-3 alkyl group; R 2 is a group represented by the formula: -O-X 1 -X 2 -O-(CH 2 -CH 2 -O) p -Y: wherein X 1 is a C 1-6 alkylene group optionally substituted by 1 to 4 halogen atoms, X 2 is (i) a bond, or (ii) a group represented by the formula: wherein n is an integer of 1 to 4, p is an integer of 0 to 7, and Y is (i) a hydrogen atom, or (ii) a C 1-6 alkyl group optionally substituted by 1 to 3 halogen atoms, a group represented by the formula: -O-X 3 -Z 1: wherein X 3 is a C 1-6 alkylene group optionally substituted by 1 to 4 halogen atoms, and Z 1 is (i) a cyano group, (ii) a C 1-6 alkylsulfonyl group, or (iii) a 3- to 8-membered monocyclic non-aromatic heterocyclic group, a group represented by the formula: -O-X 4 -Z 2: wherein X 4 is a bond or a C 1-6 alkylene group optionally substituted by 1 to 4 halogen atoms, and Z 2 is a 5- or 6-membered monocyclic aromatic heterocyclic group optionally substituted by 1 to 3 C 1-6 alkyl groups, or a hydroxy group; R 3 is a cyano group or a halogen atom; and R 4 is a morpholinyl group or a bridged morpholinyl group, each optionally substituted by 1 to 3 C 1-6 alkyl groups; or a salt thereof. A is CH or N; R 1 is a C 1-3 alkyl group; R 2 is a group represented by the formula: -O-X 1 -X 2 -O-(CH 2 -CH 2 -O) p -Y: wherein X 1 is a C 1-6 alkylene group optionally substituted by 1 to 4 halogen atoms, X 2 is (i) a bond, or (ii) a group represented by the formula: wherein n is an integer of 1 to 4, p is an integer of 0 to 7, and Y is (i) a hydrogen atom, or (ii) a C 1-6 alkyl group optionally substituted by 1 to 3 halogen atoms, a group represented by the formula: -O-X 3 -Z 1: wherein X 3 is a C 1-6 alkylene group optionally substituted by 1 to 4 halogen atoms, and Z 1 is (i) a cyano group, (ii) a C 1-6 alkylsulfonyl group, or (iii) a 3- to 8-membered monocyclic non-aromatic heterocyclic group, a group represented by the formula: -O-X 4 -Z 2: wherein X 4 is a bond or a C 1-6 alkylene group optionally substituted by 1 to 4 halogen atoms, and Z 2 is a 5- or 6-membered monocyclic aromatic heterocyclic group optionally substituted by 1 to 3 C 1-6 alkyl groups, or a hydroxy group; a group represented by the formula: -O-X 1 -X 2 -O-(CH 2 -CH 2 -O) p -Y: wherein X 1 is a C 1-6 alkylene group optionally substituted by 1 to 4 halogen atoms, X 2 is (i) a bond, or (ii) a group represented by the formula: wherein n is an integer of 1 to 4, p is an integer of 0 to 7, and Y is (i) a hydrogen atom, or (ii) a C 1-6 alkyl group optionally substituted by 1 to 3 halogen atoms, X 1 is a C 1-6 alkylene group optionally substituted by 1 to 4 halogen atoms, X 2 is (i) a bond, or (ii) a group represented by the formula: wherein n is an integer of 1 to 4, (i) a bond, or (ii) a group represented by the formula: wherein n is an integer of 1 to 4, p is an integer of 0 to 7, and Y is (i) a hydrogen atom, or (ii) a C 1-6 alkyl group optionally substituted by 1 to 3 halogen atoms, (i) a hydrogen atom, or (ii) a C 1-6 alkyl group optionally substituted by 1 to 3 halogen atoms, a group represented by the formula: -O-X 3 -Z 1: wherein X 3 is a C 1-6 alkylene group optionally substituted by 1 to 4 halogen atoms, and Z 1 is (i) a cyano group, (ii) a C 1-6 alkylsulfonyl group, or (iii) a 3- to 8-membered monocyclic non-aromatic heterocyclic group, X 3 is a C 1-6 alkylene group optionally substituted by 1 to 4 halogen atoms, and Z 1 is (i) a cyano group, (ii) a C 1-6 alkylsulfonyl group, or (iii) a 3- to 8-membered monocyclic non-aromatic heterocyclic group, (i) a cyano group, (ii) a C 1-6 alkylsulfonyl group, or (iii) a 3- to 8-membered monocyclic non-aromatic heterocyclic group, a group represented by the formula: -O-X 4 -Z 2: wherein X 4 is a bond or a C 1-6 alkylene group optionally substituted by 1 to 4 halogen atoms, and Z 2 is a 5- or 6-membered monocyclic aromatic heterocyclic group optionally substituted by 1 to 3 C 1-6 alkyl groups, or X 4 is a bond or a C 1-6 alkylene group optionally substituted by 1 to 4 halogen atoms, and Z 2 is a 5- or 6-membered monocyclic aromatic heterocyclic group optionally substituted by 1 to 3 C 1-6 alkyl groups, or a hydroxy group; R 3 is a cyano group or a halogen atom; and R 4 is a morpholinyl group or a bridged morpholinyl group, each optionally substituted by 1 to 3 C 1-6 alkyl groups; or a salt thereof.