DesmethylThiosildenafil;5-[2-Ethoxy-5-(1-piperazinylsulfonyl)phenyl]-1,6-dihydro-1-Methyl-3-propyl-7H-pyrazolo[4,3-d]pyriMidine-7-thione;SildenafilN-DesmethylThioneImpurity;5-(2-ethoxy-5-piperazin-1-ylsulfonylphenyl)-1-methyl-3-propyl-4H-pyrazolo[4,3-d]pyrimidine-7-thione;7H-Pyrazolo[4,3-d]pyrimidine-7-thione,5-[2-ethoxy-5-(1-piperazinylsulfonyl)phenyl]-1,6-dihydro-1-methyl-3-propyl-;Desmethylthiosildenafi1;Demethylthio-Sildenafil
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