Chemical Name: 4-Ethoxy-3-(1-methyl-7-oxo-3-propyl-6,7-dihydro-1H-pyrazolo[4,3-d]pyrimidin-5-yl)benzenesulfonic acid (as per EP)
Synonym: Desmethylpiperazinyl Sildenafil Sulfonic Acid
Smiles: O=S(C1=CC=C(OCC)C(C2=NC3=C(N(C)N=C3CCC)C(N2)=O)=C1)(O)=O
Inchi: InChI=1S/C20H26N6O4S/c1-4-5-15-17-18(25(3)23-15)20(28)22-19(21-17)14-12-13(6-7-16(14)27)31(29,30)26-10-8-24(2)9-11-26/h6-7,12,27H,4-5,8-11H2,1-3H3,(H,21,22,28)
Quantification of active pharmaceutical ingredient and impurities in sildenafil citrate obtained from the Internet
Michael A Veronin , Mohammad T Nutan , Uday Krishna Reddy Dodla
Ther Adv Drug Saf. 2014 Oct;5(5):180-9
Validated Methods for Determination of Sildenafil Citrate in The Presence of its Potential Impurities
A.E. El-Gindy , E. Shokry M. Farouk , L. Abd El-Aziz
J Biomed Sci and Res., Vol 2 (4), 2010,262-278
Validated LC method for sildenafil citrate related substances and its potential oxidative degradation product
A.Nageswari, P.Surya Prakash Rao, B.Gowri Sankar Rao, B.Satyanarayana , M.Saravanan , V.Ranga Reddy , Mukkanti
ACAIJ, 10(10) 2011 [683-690]
Determinaton of sildenafil citrate and related substances in the commercial products and tablet dosage form using HPLC
N Daraghmeh, M Al-Omari, A.ABadwan, A.M.YJaber
Journal of Pharmaceutical and Biomedical Analysis Volume 25, Issues 3–4, June 2001, Pages 483-492