Синонимы: Sildenafil Citrate Imp. A (EP), Sildenafil Imp. A (EP), Sildenafil USP Related Compound A, Sildenafil USP RC A, 7H-Pyrazolo[4,3-d]pyrimidin-7-one, 5-[2-ethoxy-5-[(4-methyl-1-piperazinyl)sulfonyl]phenyl]-1,6-dihydro-1-methyl-3-(2-methylpropyl)-, 5-[2-ethoxy-5-[(4-methylpiperazin-1-yl)sulfonyl]phenyl]-1-methyl-3-(2-methylpropyl)-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one, Sildenafil Related Compound A (USP), Sildenafil Related Compound A, Sildenafil Citrate Impurity A, Sildenafil Impurity A