Sildenafil Systematic (IUPAC) name 1-[4-ethoxy-3-(6,7-dihydro-1-methyl- 7-oxo-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-5-yl) phenylsulfonyl]-4-methylpiperazine citrate Identifiers CAS number 171599-83-0 ATC code G04BE03 PubChem 5281023 DrugBank APRD00556 Chemical data Formula C22H30N6O4S · C6H8O7 Mol. weight base: 474.6 g/mol salt: 666.7 g/mol SMILES O=S(=O)(N1CCN(C)CC1)c4cc(C=2NC(=O) c3n(C)nc(CCC)c3N=2)c(OCC)cc4 Pharmacokinetic data Bioavailability  ? Me ...
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