Kuraridine is measured against cGMP PDE5 to identify potent cGMP specific phosphodiesterase type 5 inhibitory constituents.

Deltasonamide 2 is a competitive, high affinity PDEδ inhibitor with a Kd of ~385 pM.

Roflupram是一种选择性的PDE4抑制剂（IC50=26.2 nM），具有口服活性和可透过血脑屏障的优点，能够逆转认知缺陷并和抑制促炎因子产生。

PF-04449613 is a phosphodiesterase 9A (PDE9A) inhibitor (IC50= 22 nM).1It is selective for PDE9A over PDE1C (IC50= >1,000 nM), as well as over a variety of other PDEs, inhibiting PDE2-8, -10, and -11 activity by less than 30% in a panel of enzymes, ion channels, and transporters at 1 μM but does inhibit the human dopamine transporter (DAT; Ki= 293 nM). PF-04449613 (0.1-100 mg/kg, s.c.) increases cerebrospinal fluid (CSF) levels of cyclic GMP (cGMP) in rats. Subcutaneous administration of PF-04449613 (10 mg/kg) increases the rate of dendritic spine formation and elimination in mouse primary motor cortex pyramidal neuronsin vivo.2It increases the average running speed of mice in an accelerating rotarod task, indicating improved motor learning, at the same dose. 1.Claffey, M.M., Helal, C.J., Verhoest, P.R., et al.Application of structure-based drug design and parallel chemistry to identify selective, brain penetrant, in vivo active phosphodiesterase 9A inhibitorsJ. Med. Chem.55(21)9055-90

8-CPT-Cyclic AMP sodium是一种cAMP依赖性蛋白激酶(PKA)的激活剂和cAMP受体激活剂，也是一种cAMP特异性磷酸二酯酶(PDE VA)的抑制剂（IC50=0.9 μM），对PDE III和PDE IV的IC50分别为24和25μM。

Denbufylline (BRL 30892) 是一种磷酸二酯酶-4 (PDE4) 抑制剂，通过抑制细胞内 cAMP (环磷酸腺苷) 的降解来升高细胞内 cAMP 水平，从而调节多种细胞功能。Denbufylline 可用于慢性阻塞性肺病 (COPD)、哮喘及其他炎症性疾病的研究。