5-(2-ethoxy-5-((4-(2-hydroxyethyl)piperazin-1- yl)sulfonyl)phenyl)-1-methyl-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-7(6H)-one,5-(2-ethoxy-5-((4-(2-hydroxyethyl)piperazin-1- yl)sulfonyl)phenyl)-1-methyl-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-7(6H)-one,Sildenafil
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