Aromatic ring compound

A compound represented by the formula:

• wherein
• ring AB is optionally further substituted;
• Ar1 is an optionally substituted 5- or 6-membered aromatic ring group;
• X1 is CR1 or N;
• X2 and X3 are each independently CH or N;
• one of Y1 and Y2 is a carbon atom and the other is a nitrogen atom;
• W is a bond, an optionally substituted C1-6 alkylene group, or an optionally substituted C2-6 alkenylene group;
• and
• R1 is a hydrogen atom, a halogen atom, an optionally substituted C1-6 alkyl group, an optionally substituted C3-10 cycloalkyl group or an optionally substituted C1-6 alkoxy group,
• or a salt thereof.