Синонимы: Sildenafil Citrate Imp. C (EP), Sildenafil Imp. C (EP), 5-[2-Hydroxy-5-[(4-methylpiperazin-1-yl)sulfonyl]phenyl]-1-methyl-3-propyl-6,7-dihydro-1H-pyrazolo[4,3-d]pyrimidin-7-one, Desethylsildenafil, Sildenafil Citrate Impurity C, Sildenafil Impurity C