Cayman Chemical Item Number 10010421

M&B 22,948; 2-(o-Propoxyphenyl)-8-azapurin-6-one (CAS 37762-06-4)

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The cyclic nucleotide second messenger guanosine 3’5’-cyclic monophosphate (cGMP) is an important mediator of signal transduction and hence a wide range of cellular processes. It can be generated by soluble guanylyl cyclase in response to binding of nitric oxide and degraded via members of the phosphodiesterase (PDE) protein family. Zaprinast, the compound from which sildenafil (Viagra™) was developed, is a cGMP-specific phosphodiesterase inhibitor. It moderately inhibits PDE5 and PDE6 with IC50 values of 0.5-0.76 and 0.15 µM, respectively, and weakly inhibits PDE9, PDE10, and PDE11 with IC50 values of 35, 22, and 11-33 µM, respectively.1,2 Zaprinast therefore enhances the vasodilatory effects of nitric oxide in a range of vascular tissues by prolonging the cGMP-mediated activation of cGMP-dependent protein kinase.2 Zaprinast also activates both the rat and human G protein-coupled receptor, GPR35 with EC50 values of 16 nM and 0.84 µM, respectively.3

1. Nakamizo, T., Kawamata, J., Yoshida, K., et al. Phosphodiesterase inhibitors are neuroprotective to cultured spinal motor neurons. J Neurosci Res 71 485-495 (2003).

2. Gibson, A. Phosphodiesterase 5 inhibitors and nitrergic transmission-from zaprinast to sildenafil. Eur J Pharmacol 411 1-10 (2001).

3. Taniguchi, Y., Tonai-Kachi, H., and Shinjo, K. Zaprinast, a well-known cyclic guanosine monophosphate-specific phosphodiesterase inhibitor, is an agonist for GPR35. FEBS Lett 580 5003-5008 (2006).

  • M&B 22,948
  • 2-(o-Propoxyphenyl)-8-azapurin-6-one
Formal Name 3,​6-​dihydro-​5-​(2-​propoxyphenyl)-​7H-​1,​2,​3-​triazolo[4,​5-​d]pyrimidin-​7-​one
CAS Number 37762-06-4
Molecular Formula C13H13N5O2
Formula Weight 271.3
Formulation A crystalline solid
Purity ≥98%
Stability 1 year
Storage -20°C
Shipping Room temperature in continental US; may vary elsewhere
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Size Price Quantity Subtotal
10 mg $21.00 $0.00
50 mg $95.00 $0.00
100 mg $168.00 $0.00
250 mg $368.00 $0.00
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Cart Total $0.00

Pricing updated 2015-07-31. Prices are subject to change without notice.

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