Fused bicyclic pyridine derivatives as tachykinin receptor antagonists

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
• that are each independently selected from the group consisting of a halogen atom, an unsubstituted C1 to C6 alkyl group, a halogen-substituted C1 to C6 alkyl group, an unsubstituted C1 to C6 alkoxy group and a halogen-substituted C1 to C6 alkoxy group;
• R1 and R2 are each independently a hydrogen atom, a C1 to C6 alkyl group, a C1 to C6 alkylsulfonyl group, a C1 to C6 alkylcarbonyl group, or a C1 to C6 alkoxycarbonyl group, or R1 and R2 are bound to one another to form the ring D, which is a 3- to 7-membered non-aromatic heterocyclic ring that 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 group-substituted carbon atoms;
• m is 1 or 2;
• n is 2 or 3;
• and q is an integer from 1 to 4.