4-Nitrophenyl phenylphosphonate is a substrate for 5'-nucleotide phosphodiesterases. It is a more preferable substrate to 5'-nucleotide phosphodiesterases than naturally occurring nucleotides or bis(4-nitrophenyl) phosphate because of its stability, ease of synthesis, and higher rate of hydrolysis under saturating conditions.

CDP-840 (GR259653X) 是一种有效的、选择性和口服活性的phosphodiesterase IV (PDE IV)抑制剂。CDP-840 抑制有意识的松鼠猴中抗原诱导的早期和晚期支气管收缩。

Tadalafil-D3是Tadalafil (T1398)的氘代化合物。Tadalafil的CAS号为171596-29-5。Tadalafil是一种PDE5抑制剂，IC50为 1.8 nM。

Ophiobolin A is a fungal metabolite and a phytotoxin and is an effective and irreversibly inhibitor of calmodulin-activated cyclic nucleotide phosphodiesterase (IC50: 9 μM). Ophiobolin A also has antimicrobial and anticancer activity.

ITI-214 free base is a picomolar PDE1 inhibitor with excellent selectivity against other PDE family members and against a panel of enzymes, receptors, transporters, and ion channels, exhibits potent PDE1 inhibitory activity (Ki = 58 pM).

PF-04671536 is a highly potent and selective inhibitor of phosphodiesterase 8B (PDE8B) phosphodiesterase 8A (PDE8A). In primary human pancreatic islets, PF-04671536 increases insulin secretion in a glucose-dependent manner.