Nitrogen-containing heterocyclic compound and use of same

A compound represented by the formula

• wherein:
• ring B is an aromatic ring optionally having substituent(s);
• ring D is a phenyl optionally having substituent(s) or an aromatic heterocyclic group optionally having substituent(s), wherein 6-quinolyl is excluded;
• R2 and R3 are each independently a hydrogen atom, a halogenated C1-6 alkyl group or an optionally halogenated C3-6 cycloalkyl group, or R2 and R3 are optionally bonded via an alkylene chain or an alkenylene chain;
• R1 is an alkyl group substituted by a C1-6 alkoxy group;
• or a salt thereof.

A compound represented by the formula

• wherein:
• ring A is a pyrrolidine ring and each straight line is a single bond and is a single bond;
• ring B is an aromatic ring optionally having substituent(s);
• ring D is an aromatic ring optionally having substituent(s), wherein 6-quinolyl is excluded;
• L is a group represented by the formula
• R2, R3, R4a and R4b are each independently a hydrogen atom, a halogenated C1-6 alkyl group or an optionally halogenated C3-6 cycloalkyl group, or R2 and R3 are optionally bonded via an alkylene chain or an alkenylene chain, or R4a and R4b are optionally bonded via an alkylene chain or an alkenylene chain;
• R1 is an alkyl group substituted by a C1-6 alkoxy group;
• m and n are each independently an integer of 0 to 2;
• and
• m+n is an integer of 2;
• provided that when L is a group represented by the formula
• wherein each of R4a and R4b is as defined above, then ring D is an aromatic ring having substituent(s);
• or a salt thereof.