Novel pyridine derivatives and pyrimidine derivatives (3)

A compound represented by the following formula or a salt thereof:

• wherein R1 represents a 3- to 10-membered non-aromatic heterocyclic group having nitrogen as a ring constituent atom wherein said ring-constituent nitrogen atom is bonded directly to the carbonyl group to which R1 is attached, or a group represented by the formula —NR11aR11b, wherein R11a and R11b may be the same or different and each represents hydrogen, C1-6 alkyl, C3-10 cycloalkyl, C6-10 aryl, 5- to 10-membered heteroaryl or a 4- to 10-membered non-aromatic heterocyclic group, and R11a and R11b may be substituted with a substituent selected from Substituent Group A or Substituent Group B and R1 may be substituted with a substituent selected from Substituent Group A or Substituent Group B;
• R2 and R3 represent hydrogen;
• R4, R5, R6 and R7 may be the same or different and each represents hydrogen, halogen, hydroxyl, cyano, trifluoromethyl, C1-6 alkyl, C2-6 alkenyl, C2-6 alkynyl, C1-6 alkoxy, amino, mono-C1-6 alkylamino, di-C1-6 alkylamino or a group represented by the formula —CO—R12, wherein R12 represents hydrogen, hydroxyl, C1-6 alkyl, C1-6 alkoxy, amino, mono-C1-6 alkylamino or di-C1-6 alkylamino;
• R8 represents hydrogen or C1-6 alkyl;
• R9 represents a 3- to 10-membered non-aromatic heterocyclic group having nitrogen as a ring constituent atom wherein said ring-constituent nitrogen atom is bonded directly to the carbonyl group to which R1 is attached, or a group represented by the formula —NR11aR11b, wherein R11a and R11b represent the same meaning as described above and R9 may be substituted with a substituent selected from Substituent Group A or Substituent Group B;
• n represents an integer of 1 or 2;
• and
• X represents a group represented by the formula —C(R10)═ or nitrogen, wherein R10 represents hydrogen, halogen, cyano, C1-6 alkyl, C2-6 alkenyl, C2-6 alkynyl or a group represented by the formula —CO—R12, wherein R12 represents the same meaning as recited above;
• wherein Substituent Group A substituents are halogen, hydroxyl, or oxo;
• wherein Substituent Group B substituents are C1-6 alkyl, C3-10 cycloalkyl, C6-10 aryl, 5- to 10-membered heteroaryl, a 3- to 10-membered non-aromatic heterocyclic group, C1-6 alkoxy, 5- to 10-membered heteroaryloxy, 4- to 10-membered non-aromatic heterocyclicoxy, or a group represented by the formula -T1-T2-T3, and each group in Substituent Group B may be substituted with a substituent selected from Substituent Group C, wherein T1 represents a direct bond or C1-6 alkylene, T2 represents a group represented by the formula —NRT1—, T3 represents hydrogen or C1-6 alkyl, and RT1 represents hydrogen or C1-6 alkyl;
• and
• wherein Substituent Group C substituents are hydroxyl, C1-6 alkyl, a 3- to 10-membered non-aromatic heterocyclic group, or di-C1-6 alkylamino.