Compounds of formula (I):
wherein R
1
, R
2
, R
3
, R
5
, R
6
, A
1
, A
2
, A
3
, A
4
assume meanings as defined in formula (I) are inhibitors of neutrophil elastase.
Compounds of formula (I) described herein are imidazolone derivatives having human neutrophil elastase (HNE) inhibitory properties and are useful for the treatment of diseases and conditions in which HNE is implicated.
Compounds of formula (I) defined herein exhibit human neutrophil elastase inhibitory properties and are useful for the treatment of disease or conditions in which HNE is implicated.