GPR52 modulator compounds

A compound of Formula (1):

• or a pharmaceutically acceptable salt thereof, wherein;
• X is N or CR5;
• Y is N or CR6;
• R1 is H, C1-6 alkyl optionally substituted with OH or 1 to 6 fluorine atoms, C3-6 cycloalkyl optionally substituted with OH or 1 to 6 fluorine atoms, wherein when the C1-6 alkyl or C3-6 cycloalkyl group is not substituted with OH, one atom of the C1-6 alkyl or C3-6 cycloalkyl group may be optionally replaced by an O atom which is not directly attached to the N or attached to a carbon atom which is directly attached to the N;
• or R1 is joined to R2 to form a 4, 5, 6 or 7-membered ring which is optionally substituted with OH or 1 to 6 fluorine atoms;
• R2 is H or C1-3 alkyl optionally substituted with OH or 1 to 6 fluorine atoms;
• or R2 is joined to R1 to form a 4, 5, 6 or 7-membered ring which is optionally substituted with OH or 1 to 6 fluorine atoms;
• R4, R5 and R6 are independently selected from H, CN, halo, C1-6 alkyl optionally substituted with OH or 1 to 6 fluorine atoms, C3-6 cycloalkyl optionally substituted with OH or 1 to 6 fluorine atoms and C1-6 alkoxy optionally substituted with 1 to 6 fluorine atoms, wherein when the C1-6 alkyl or C3-6 cycloalkyl group is not substituted with OH, one atom of the C1-6 alkyl or C3-6 cycloalkyl group may be optionally replaced by O;
• R3 is a group of the formula:
• L is CH2 or CHOH;
• and
• the group: