PF-04447943 (Edelinontrine) is a potent and selective phosphodiesterase 9A inhibitor with an IC50 of 12 nM, which is 78-fold more selective than that used for other PDE family members (IC50>1000 nM).PF-04447943 exhibits anti-inflammatory activity, attenuates inflammatory responses by inhibiting oxidative stress, inflammation, and modulating T-cell polarization, and may be useful for research on sickle cell anemia.

Moracin M, a phenolic compound found in the skin of Morus alba Linn., effectively inhibits phosphodiesterase-4 (PDE4), exhibiting IC50 values of 2.9 μM and 4.5 μM for PDE4D2 and PDE4B2, respectively, and showing significantly lesser activity on PDE5A1 and PDE9A2 with values over 40 μM and 100 μM, respectively. This compound demonstrates notable anti-inflammatory activity.

PF-05085727 inhibits PDE2A >4,000-fold selectivity over PDE1 and PDE3-11. PF-05085727 is an effective, selective and brain penetrant inhibitor of cGMP-dependent PDE2A (IC50=2 nM) .

SEP-0372814 is a potent inhibitor of PDE10.

K-Ras-PDEδ-IN-1 is a potent inhibitor of competitive K-Ras-PDEδ.It binds to the farnesyl binding pocket of PDEδ(Kd of 8 nM).