英文别名5-(2-Ethoxy-5-(2-(4-ethyl-3-oxopiperazin-1-yl)acetyl)phenyl)-1-methyl-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-7(6H)-one; 5-[2-ethoxy-5-[2-(4-ethyl-3-oxopiperazin-1-yl)acetyl]phenyl]-1-methyl-3-propyl-6H-pyrazolo[4,3-d]pyrimidin-7-one; 4-[2-(4-ethoxy-3-{1-methyl-7-oxo-3-propyl-1H,6H,7H-pyrazolo[4,3-d]pyrimidin-5-yl}phenyl)-2-oxoethyl]-1-ethylpiperazin-2-one; 5-(2-ethoxy-5-(2-(4-ethyl-3-oxopiperazin-1-yl)acetyl)phenyl)-1-methyl-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-7(4H)-one; Acetildenafil Impurity 2; Sildenafil Impurity 135 
