A compound of Formula (I):
or a pharmaceutically and/or veterinarily acceptable derivative thereof, wherein R
1
, R
2
, R
3
, R
4
, R
5
, and R
8
are as defined above.
The disclosures herein relate to novel compounds of formula (1): and salts thereof, wherein A; X; n; R
1
and R
2
are defined herein, and their use in treating, preventing, ameliorating, controlling or reducing the risk of disorders associated with H4 receptors.