SDF06: Sildenafil EP Impurity F

SDF06: Sildenafil EP Impurity F

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N-Desmethyl Sildenafil ;

5-[2-Ethoxy-5-(piperazin-1-yl)sulfonylphenyl]-1-methyl-3-propyl-4H-pyrazolo[5,4-e]pyrimidin-7-one ;

CAS # 139755-82-1 ;

C21H28N6O4S ;

MW: 460.55 ;