139755-82-1

139755-82-1 structure

Name: N-Desmethyl Sildenafil
Chemical Name: N-Desmethyl Sildenafil
CAS Number: 139755-82-1
Molecular Formula: C₂₁H₂₈N₆O₄S
Molecular Weight: 460.55
Catalog: Signaling Pathways Metabolic Enzyme/Protease Phosphodiesterase (PDE)
Create Date: 2018-07-30 19:25:19
Modify Date: 2025-09-01 13:30:07
N-Desmethyl Sildenafil (Desmethylsildenafil) is a major metabolite of Sildenafil. Sildenafil is a potent phosphodiesterase type 5 (PDE5) inhibitor[1][2].

Name	N-Desmethyl Sildenafil
Synonyms	5-(2-ethoxy-5-piperazin-1-ylsulfonylphenyl)-1-methyl-3-propyl-4H-pyrazolo[4,3-d]pyrimidin-7-one

Description	N-Desmethyl Sildenafil (Desmethylsildenafil) is a major metabolite of Sildenafil. Sildenafil is a potent phosphodiesterase type 5 (PDE5) inhibitor[1][2].
Related Catalog	Research Areas >> Cardiovascular Disease Signaling Pathways >> Metabolic Enzyme/Protease >> Phosphodiesterase (PDE)
In Vitro	N-Desmethyl Sildenafil increases the amplitude of electroretinogram (ERG) recorded from the dark-adapted isolated rat retina, most probably through the enhancement of the photoreceptor cell response[1]. The formation of N-Desmethyl Sildenafil is examined using CYP3A supersomes co-expressing human P450 oxidoreductase and cytochrome b5. N-Desmethyl Sildenafil is catalyzed by CYP3A4, CYP3A5, and to a lesser extent by CYP3A7[2].
References	[1]. Péter Barabás, et al. Sildenafil, N-desmethyl-sildenafil and Zaprinast enhance photoreceptor response in the isolated rat retina. Neurochem Int. 2003 Nov;43(6):591-5. [2]. Rikako Takahiro, et al. Contribution of CYP3A isoforms to dealkylation of PDE5 inhibitors: a comparison between sildenafil N-demethylation and tadalafil demethylenation. Biol Pharm Bull. 2015;38(1):58-65.