API
IMPURITY
CHEMICAL NAME
STRUCTURE
2
Sildenafil Citrate

EP Impurity B

4-{[4-Ethoxy-3-(1-methyl-7-oxo-3-propyl-6,7-dihydro-1H-Pyrazolo[4,3-d]pyrimidin-5-yl)phenyl]sulfonyl}-1-methylhexahydropyrozin-1-ium-1-olate Sildenafil-Citrate-EP-Impurity-B
Sildenafil Citrate

EP Impurity D

4-Ethoxy -3-(6,7-dIhydro-1-methyl-7-oxo-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-5-yl)benzenesulfonic acid(Demethylpiperazinyl Sildenafil Sulfonic Acid) Sildenafil-Citrate-EP-Impurity-D
Sildenafil Citrate

Sildenafil Impurity

4-Ethoxy benzoic acid Sildenafil-Impurity-4-Ethoxy-benzoic-acid
Sildenafil Citrate

Sildenafil Dimer Impurity

5-{2-Ethoxy-5-[(4-{[4-ethoxy-3-(1-methyl-7-oxo-3-propyl-6,7-dihydro-1Hpyrazolo[ 4,3-d]pyrimidin-5-yl)phenyl]sulfonyl}piperazino)sulfonyl]phenyl}-1-methyl- 3-propyl-6,7-dihydro-1H-pyrazolo[4,3-d]pyrimidin-7-one Sildenafil-Dimer-Impurity
Sildenafil Citrate

Sildenafil Impurity

4-(2-Ethoxy benzamido)-1-methyl-3-n-propyl pyrazole-5-carboxamide Sildenafil-Citrate-Sildenafil-Impurity
Sildenafil Citrate

Sildenafil Impurity

2-Ethoxy benzoic acid Sildenafil-Impurity-2-Ethoxy-benzoic-acid
Sildenafil Citrate

Sildenafil Impurity

3-Ethoxy benzoic acid Sildenafil-Impurity-3-Ethoxy-benzoic-acid
Sildenafil Citrate

Sildenafil Impurity

4-(2-Ethoxy benzamido)-1-methyl-3-n-propyl pyrazole-5-carboxamide Sildenafil-Impurity-4-(2-Ethoxy-benzamido)
Sildenafil Citrate

Sildenafil Impurity

1-Methyl-4-nitro-3-propyl-1H-pyrazole-5-carboxamide(Sildenafil amide) Sildenafil-Impurity1-Methyl-4
Sildenafil Citrate

Sildenafil Impurity

5-(2 Ethoxy phenyl)-1-methyl-3-n-propyl-1,6-dihydro-7H-pyrazolo[4,3- d]pyrimidine-7-one(Sildenafil Lactam Impurity) Sildenafil-Impurity5-(2-Ethoxy-phenyl)
Sildenafil Citrate

Sildenafil Impurity

1-[[3-(4,7-Dihydro-1-methyl-7-oxo-3-propyl-1H-Pyrazolo[4,3-d]pyrimidine-5-yl)-4-ethoxyphenyl]sulfonyl]piperazine(Sildenafil N-desmethyl Metabolite) Sildenafil-Impurity-1-[[3-(4,7-Dihydro
Sildenafil Citrate

Sildenafil Impurity

5-{2-Ethoxy-5-[(4-methypiperzino)sulfonyl]phenyl}-3-ethyl-1-methyl-6,7-dihydro-1H-pyrazolo[4,3-d]pyrimidin-7-one Sildenafil-Impurity-5-{2-Ethoxy
SILDENAFIL RELATED COMPOUND-A

SILDENAFIL RELATED COMPOUND-A

"5-[2-Ethoxy-5-[(4-methylpiperazin-1-yl)sulfonyl]phenyl]-1-methyl-3-(2-methylpropyl)-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one " SILDENAFIL