英文别名5-[2-ethoxy-5-(4-methylpiperazin-1-yl)sulfonylphenyl]-3-propyl-2,4-dihydropyrazolo[4,3-d]pyrimidin-7-one; 1-[[3-(4,7-Dihydroxy-7-oxo-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-5-yl)-4-ethoxyphenyl]sulfonyl]-4-methyl-piperazine; 5-{2-ethoxy-5-[(4-methylpiperazin-1-yl)sulfonyl]phenyl}-3-propyl-2,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one; 5-(2-Ethoxy-5-((4-methyl-1-piperazinyl)sulfonyl)phenyl)-1,6-dihydro-3-propyl-7H-pyrazolo(4,3-d)pyrimidin-7-one; 5-(2-Ethoxy-5-(4-methylpiperazin-1-ylsulfonyl)phenyl)-3-propyl-1,6-dihydro-7H-pyrazolo(4,3-d)pyrimidin-7-one; 7H-Pyrazolo(4,3-d)pyrimidin-7-one, 5-(2-ethoxy-5-((4-methyl-1-piperazinyl)sulfonyl)phenyl)-1,6-dihydro-3-propyl-; Piperazine, 1-((3-(4,7-dihydroxy-7-oxo-3-propyl-1H-pyrazolo(4,3-d)pyrimidin-5-yl)-4-ethoxyphenyl)sulfonyl)-4-methyl-; 7H-Pyrazolo[4,3-d]pyrimidin-7-one, 5-[2-ethoxy-5-[(4-methyl-1-piperazinyl)sulfonyl]phenyl]-1,6-dihydro-3-propyl-; Pyrazole N-Desmethyl Sildenafil; Sildenafil Impurity M; Sildenafil Impurity 170 
