英文别名5-(2-Ethoxyphenyl)-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-7(6H)-one; 7H-Pyrazolo[4,3-d]pyrimidin-7-one, 5-(2-ethoxyphenyl)-1,6-dihydro-3-propyl; Sildenafil Impurity 168; 5-(2-ethoxyphenyl)-3-propyl-2,4-dihydropyrazolo[4,3-d]pyrimidin-7-one; 5-(2-ethoxyphenyl)-3-n-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one 
