Modulators of G protein-coupled receptor 88

1. A compound of Formula (I)

or a pharmaceutically acceptable salt thereof, wherein

A is phenyl;

R 1 is C 4 -C 6 alkoxy;

R 2 is selected from hydrogen, C 1 -C 3 alkyl; and halo;

R 3 is hydroxy-C 1 -C 3 alkyl;

R 4 is selected from C 1 -C 3 alkyl and hydroxy-C 1 -C 3 alkyl;

R 4′ is selected from hydrogen and C 1 -C 3 alkyl; or

R 4 and R 4′ , together with the carbon atom to which they are attached, form a C 3 -C 6 cycloalkyl ring; and

R 5 is selected from hydrogen, C 1 -C 3 alkyl, and halo.

2. A compound of formula (II)

or a pharmaceutically acceptable salt thereof, wherein

R 1 is C 4 -C 6 alkoxy;

R 3 is selected from

hydroxy-C 1 -C 3 alkyl; and

(NR a R b )—C 1 alkyl; wherein R a and R b are each independently selected from hydrogen;

C 1 -C 5 alkyl;

C 3 -C 5 cycloalkyl-C 1 alkyl wherein the cycloalkyl is optionally substituted with an amino group;

heterocyclyl-C 1 alkyl;

R 6 —C(O)—; wherein R 6 is selected from

amino-C 1 -C 5 alkyl wherein the alkyl is optionally substituted with a C 1 alkoxy group;

C 3 cycloalkyl-C 2 alkyl wherein the alkyl part is substituted with an amino group;

heterocyclyl; and

heterocyclyl-C 2 alkyl, wherein the alkyl part is substituted with an amino group;

or, R a and R b , together with the nitrogen atom to which they are attached, for a morpholinyl or piperazinyl ring wherein the piperazinyl ring is substituted with C 1 -C 3 alkyl; and

R 4 is selected from C 1 -C 2 alkyl and hydroxy-C 1 alkyl.

3. A compound according to claim 2 selected from

or a pharmaceutically acceptable salt thereof.

4. A composition comprising a compound of claim 1 , or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier.