"5-[2-Ethoxy-5-[(4-(methyl-d3)-1-piperazinyl)sulfonyl]phenyl]-2,6-dihydro-2-methyl-3-propyl-7H-pyrazolo[4,3-d]pyrimidin-7-one; 1-[[3-(4,7-Dihydro-2-methyl-7-oxo-3-",Iso Sildenafil-d3,"Labelled Iso Sildenafil (I900800). Isosildenafil is the isomer of Sildenafil methylated at N-2 position of the pyrazolo[4,3-d]pyrimidin-7-one nucleus.", Stable Isotopes
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