英文别名Sildenafil Dimer Impurity; 5,5'-((Piperazine-1,4-disulfonyl)bis(2-ethoxy-5,1-phenylene))bis(1-methyl-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-7(6H)-one); 5,5'-{1,4-Piperazinediylbis[sulfonyl(6-ethoxy-3,1-phenylene)]}bis(1-methyl-3-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one); 5,5'-(1,4-Piperazinediylbis(sulfonyl(6-ethoxy-3,1-phenylene)))bis(1,6-dihydro-1-methyl-3-propyl-7H-pyrazolo(4,3-d)pyrimidin-7-one); Sildenafil coupled; 5,5'-[Piperazin-1,4-diylbis[dioxo-lambda6-sulfanediyl(2-ethoxy-5,1-phenylene)]]bis(1-methyl-3-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one); 5-[2-ethoxy-5-[4-[4-ethoxy-3-(1-methyl-7-oxo-3-propyl-6H-pyrazolo[4,3-d]pyrimidin-5-yl)phenyl]sulfonylpiperazin-1-yl]sulfonylphenyl]-1-methyl-3-propyl-6H-pyrazolo[4,3-d]pyrimidin-7-one; Sildenafil Disulfonamide Dimer Impurity; Sildenafil Impurity O; Sildenafil O 
