Structural Formula Vector Image
Title: Sildenafil
CAS Registry Number: 139755-83-2
CAS Name: 1-[[3-(4,7-Dihydro-1-methyl-7-oxo-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-5-yl)-4-ethoxyphenyl]sulfonyl]-4-methylpiperazine
Additional Names: 5-[2-ethoxy-5-(4-methylpiperazinylsulfonyl)phenyl]-1-methyl-3-n-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one
Manufacturers' Codes: UK-92480
Molecular Formula: C22H30N6O4S
Molecular Weight: 474.58
Percent Composition: C 55.68%, H 6.37%, N 17.71%, O 13.49%, S 6.76%
Literature References: Orally active, selective type 5 cGMP phosphodiesterase inhibitor. Prepn: A. S. Bell et al., EP 463756; eidem, US 5250534 (1992, 1993 both to Pfizer). Structure-activity study: N. K. Terrett et al., Bioorg. Med. Chem. Lett. 6, 1819 (1996). Clinical trial in impotence: I. Goldstein et al., N. Engl. J. Med. 338, 1397 (1998). Review of pharmacology: M. Boolell et al., Int. J. Impot. Res. 8, 47-52 (1996); of clinical experience: D. G. Hatzichristou, ibid. 14, Suppl. 1, S43-S52 (2002). Clinical evaluation in pulmonary hypertension: B. K. S. Sastry et al., J. Am. Coll. Cardiol. 43, 1149 (2004).
Properties: Crystals, mp 187-189°.
Melting point: mp 187-189°
Derivative Type: Citrate
CAS Registry Number: 171599-83-0
Trademarks: Revatio (Pfizer); Viagra (Pfizer)
Molecular Formula: C22H30N6O4S.C6H8O7
Molecular Weight: 666.70
Percent Composition: C 50.44%, H 5.74%, N 12.61%, O 26.40%, S 4.81%
Therap-Cat: In treatment of male erectile dysfunction. Antihypertensive.
Keywords: Phosphodiesterase Inhibitor; Impotence Therapy; Antihypertensive.

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