Fused bicyclic pyrimidine derivatives

A compound of formula (1), or a salt thereof:

• wherein the rings A and B are each a benzene ring, which may have 1 to 3 substituents (any adjacent two of which may be bound to one another to form a ring selected from the group consisting of
• each independently selected from the group consisting of a halogen atom, a C1 to C6 alkyl group, which may be substituted with a halogen atom, and a C1 to C6 alkoxyl group;
• the ring C is a 5- to 7-membered nitrogen-containing ring, which may contain, aside from the nitrogen atom, 1 to 3 heteroatoms selected from the group consisting of a nitrogen atom, a sulfur atom, and an oxygen atom;
• the ring C may further contain a substituent (a substituent selected from the group consisting of a C1 to C6 alkyl group, a hydroxyl group, a C1 to C6 alkoxyl group, a formyl group, a C1 to C6 alkylcarbonyl group, a C1 to C6 alkoxycarbonyl group, a carbamoyl group, a mono- or di-substituted C1 to C6 alkylcarbamoyl group, a C1 to C6 alkylsulfonyl group, an amino group, a mono- or di-substituted C1 to C6 alkylamino group, a C1 to C6 alkylcarbonylamino group, a C1 to C6 alkoxycarbonylamino group, a C1 to C6 alkylsulfonylamino group, an oxo group, a 6-membered aromatic heterocyclic group, and a substituent represented by the following formula:
• wherein the ring D is a 3- to 7-membered nonaromatic heterocyclic ring, which may contain, aside from the nitrogen atom, 1 to 3 heteroatoms selected from the group consisting of a nitrogen atom, a sulfur atom, and an oxygen atom and may further contain 1 or 2 oxo-substituted carbon atoms);
• R is a hydrogen atom, a C1 to C6 alkyl group, a C1 to C6 alkylcarbonyl group, or a C1 to C6 alkylsulfonyl group;
• m is 1 or 2;
• and
• n is 2 or 3.