Hydantoin derivatives useful as kv3 inhibitors

A compound of formula (II):

• or a salt thereof;
• wherein:
• R1 is H, C1-4alkyl, halo, haloC1-4alkyl, CN, C1-4alkoxy, or haloC1-4alkoxy;
• R2 is H, C1-4alkyl, C3-4 spiro carbocyclyl, haloC1-4alkyl or halo;
• R3 is H, C1-4alkyl, haloC1-4alkyl or halo;
• A is a 5 or 6 membered saturated or unsaturated heterocycle, with at least one O atom;
• which heterocycle is optionally fused with a cyclopropyl group to form a tricycle when considered together with the phenyl;
• X is CH or N;
• Y is CH or N;
• R4 is C1-4alkyl;
• R5 is H, deuterium or C1-4alkyl;
• or R4 and R5 can be fused to form C3-4 spiro carbocyclyl.