Sildenafil EP Impurity B
CAS No 1094598-75-0
IUPAC 5-[2-Ethoxy-5-[(4-methyl-4-oxido-1-piperazinyl)sulfonyl]phenyl]-1,6-dihydro-1-methyl-3-propyl-7H-pyrazolo[4,3-d]pyrimidin-7-one
Catalogue No. PACE-S03003
Molecular Formula C₂₂H₃₀N₆O₅S
Molecular Weight 490.6 g/mol
Synonyms Sildenafil N-Oxide
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IUPAC 5-(2-Ethoxy-5-((4-methylpiperazin-1-yl)sulfonyl)phenyl)-1-methyl-3-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one
Catalogue No. PACE-S03001
Molecular Formula C₂₂H₃₀N₆O₄S
Molecular Weight 474.6 g/mol
Synonyms -
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Sildenafil EP Impurity A
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IUPAC 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
Catalogue No. PACE-S03002
Molecular Formula C₂₃H₃₂N₆O₄S
Molecular Weight 488.6 g/mol
Synonyms Sildenafil USP Related Compound A , Sildenafil Isobutyl Analog
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IUPAC 5-(2-hydroxy-5-((4-methylpiperazin-1-yl)sulfonyl)phenyl)-1-methyl-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-7(6H)-one
Catalogue No. PACE-S03004
Molecular Formula C₂₀H₂₆N₆O₄S
Molecular Weight 446.5 g/mol
Synonyms O-Desethyl Sildenafil
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Sildenafil EP Impurity D
CAS No 1357931-55-5
IUPAC 4-Ethoxy-3-(1-methyl-7-oxo-3-propyl-6,7-dihydro-1H-pyrazolo[4,3-d]pyrimidin-5-yl)benzenesulfonic acid
Catalogue No. PACE-S03005
Molecular Formula C₁₇H₂₀N₄O₅S
Molecular Weight 392.4 g/mol
Synonyms Desmethylpiperazinyl Sildenafil Sulfonic Acid
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