Pyridazin-3(2H)-one derivatives of formula (I) are found to inhibit PDE-4. R
1
, R
2
and R
4
are organic radicals, R
3
is a cyclic group, and R
5
is an ester or an aryl or heteroaryl group.
Pyridazin-3(2H)-one derivatives of formula (I) are found to inhibit PDE-4:
wherein
R
1
, R
2
and R
4
are organic radicals, R
3
is a cyclic group, and R
5
is an ester or an aryl or heteroaryl group.