5-[2-Ethoxy-5-(2,2,3,3,5,5,6,6-octadeuteriopiperazin-1-yl)sulfonylphenyl]-1-methyl-3-propyl-6H-pyrazolo[5,4-e]pyrimidin-7-one,5-[2-ethoxy-5-(2,2,3,3,5,5,6,6-octadeuteriopiperazin-1-yl)sulfonylphenyl]-1-methyl-3-propyl-6H-pyrazolo[4,3-d]pyrimidin-7-one,"Labeled Sildenafil, intended for use as an internal standard for the quantification of Sildenafil by GC- or LC-mass spectrometry.",Sildenafil Metabolite
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