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rac Xanthoanthrafil

Pyrazole N-Demethyl Sildenafil

N-Desmethyl-N-benzyl Sildenafil

Propoxyphenyl-thiohydroxyhomosildenafil

Propoxyphenyl Thiosildenafil

O-Desethyl-O-propyl Methisosildenafil

Propoxyphenyl Homohydroxysildenafil

Propoxyphenyl Thioaildenafil

Vardenafil Oxopiperazine (Impurity)

Vardenafil N-Oxide

5-[2-Ethoxy-5-[(4-methyl-1-piperazinyl)thioxomethyl]phenyl]-1,6-dihydro-1-methyl-3-propyl-7H-pyrazolo[4,3-d]pyrimidine-7-thione

Thiohomo Sildenafil

Hydroxythiohomo Sildenafil

5-(5-Carboxy-2-ethoxyphenyl)-1-methyl-3-n-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one

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