英文别名5-(2-ethoxy-5-piperazin-1-ylsulfonylphenyl)-1-methyl-3-propyl-4H-pyrazolo[4,3-d]pyrimidine-7-thione; 5-[2-Ethoxy-5-(1-piperazinylsulfonyl)phenyl]-1,6-dihydro-1-Methyl-3-propyl-7H-pyrazolo[4,3-d]pyriMidine-7-thione; Sildenafil N-Desmethyl Thione Impurity; 7H-Pyrazolo[4,3-d]pyrimidine-7-thione, 5-[2-ethoxy-5-(1-piperazinylsulfonyl)phenyl]-1,6-dihydro-1-methyl-3-propyl-; Desmethylthiosildenafil; Demethylthio-Sildenafil 
