paroxetine and its Impurities
Paroxetine is used to treat depression, panic attacks, obsessive-compulsive disorder, anxiety disorders, and post-traumatic stress disorder. It is sold under the brand names Paxil and Seroxat. It is currently available as a generic medication.Reference standards of Paroxetine API,and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.

![Phenyl (3S,4R)-3-[(1,3-benzodioxol-5-yloxy)methyl] PA 16 08680](https://www.pharmaffiliates.com/pimages/PA1608680.jpg)
Phenyl (3S,4R)-3-[(1,3-benzodioxol-5-yloxy)methyl]-4-(4-fluorophenyl)piperidine-1-carboxylate
Phenyl (3S,4R)-3-[(1,3-benzodioxol-5-yloxy)methyl]-4-(4-fluorophenyl)piperidine-1-carboxylate
Catalogue No.:PA 16 08680
CAS :
253768-88-6
Molecular Formula : C26H24FNO5
Molecular Weight : 449.47


((3S,4R)-4-(4-fluorophenyl)-1-methylpiperidin-3-yl)methanol (2R,3S,4R,5S)-2-benzoyl-2-(benzoyloxy)-3,4,5-trihydroxyhexanedioate
((3S,4R)-4-(4-fluorophenyl)-1-methylpiperidin-3-yl)methanol (2R,3S,4R,5S)-2-benzoyl-2-(benzoyloxy)-3,4,5-trihydroxyhexanedioate
Catalogue No.:PAI 16 006030
CAS :
NA
Molecular Formula : C33H36FNO11
Molecular Weight : 641.65

![(+/-)trans-3-[(1,3-Benzodioxol-5-yloxy)methyl]-4-( PA 16 08690](https://www.pharmaffiliates.com/pimages/PA1608690.jpg)
(+/-)trans-3-[(1,3-Benzodioxol-5-yloxy)methyl]-4-(4''-fluorophenyl-4'-phenyl)piperidine Hydrochloride
(+/-)trans-3-[(1,3-Benzodioxol-5-yloxy)methyl]-4-(4''-fluorophenyl-4'-phenyl)piperidine Hydrochloride
Catalogue No.:PA 16 08690
CAS :
1217655-87-2
Molecular Formula : C25H25ClFNO3
Molecular Weight : 441.93

![2-((6-((3S,4R)-3-((Benzo[d][1,3]dioxol-5-yloxy)met PA 16 08710](https://www.pharmaffiliates.com/pimages/PA1608710.jpg)
2-((6-((3S,4R)-3-((Benzo[d][1,3]dioxol-5-yloxy)methyl)-4-(4-fluorophenyl)piperidin-1-yl)-4,5-dihydroxy-2-(hydroxymethyl)tetrahydro-2H-pyran-3-yl)oxy)-6-(hydroxymethyl)tetrahydro-2H-pyran-3,4,5-triol
2-((6-((3S,4R)-3-((Benzo[d][1,3]dioxol-5-yloxy)methyl)-4-(4-fluorophenyl)piperidin-1-yl)-4,5-dihydroxy-2-(hydroxymethyl)tetrahydro-2H-pyran-3-yl)oxy)-6-(hydroxymethyl)tetrahydro-2H-pyran-3,4,5-triol
Catalogue No.:PA 16 08710
CAS :
NA
Molecular Formula : C31H40FNO13
Molecular Weight : 653.65


Paroxetine Related Compound B (trans-4-Phenyl-3-[(3,4-methylenedioxy)phenoxy]methylpiperidine hydro (1500230)
Paroxetine Related Compound B (trans-4-Phenyl-3-[(3,4-methylenedioxy)phenoxy]methylpiperidine hydro (1500230)
Catalogue No.:PA USP1500230
CAS :
NA
Molecular Formula : NA
Molecular Weight : NA


Paroxetine Related Compound E Mixture (1-Methyl-4-(p-fluorophenyl)-1,2,3,6-tetrahydropyridine in Pa (1500262)
Paroxetine Related Compound E Mixture (1-Methyl-4-(p-fluorophenyl)-1,2,3,6-tetrahydropyridine in Pa (1500262)
Catalogue No.:PA USP1500262
CAS :
NA
Molecular Formula : NA
Molecular Weight : NA


Paroxetine Related Compound F ((3S,4R)-3-[(Benzodioxol-5-yloxy)methyl]-4-(4-fluorophenyl)-1-methylp (1500273)
Paroxetine Related Compound F ((3S,4R)-3-[(Benzodioxol-5-yloxy)methyl]-4-(4-fluorophenyl)-1-methylp (1500273)
Catalogue No.:PA USP1500273
CAS :
NA
Molecular Formula : NA
Molecular Weight : NA


Paroxetine Related Compound G ((+/-)trans-3-[(1,3-benzodioxol-5-yloxy)methyl]-4-(4''-fluorophenyl-4 (1500284)
Paroxetine Related Compound G ((+/-)trans-3-[(1,3-benzodioxol-5-yloxy)methyl]-4-(4''-fluorophenyl-4 (1500284)
Catalogue No.:PA USP1500284
CAS :
NA
Molecular Formula : NA
Molecular Weight : NA


((3R,4R)-4-(4-Fluorophenyl)-1-methylpiperidin-3-yl)methanol compound with ((3S,4S)-4-(4-fluorophenyl)-1-methylpiperidin-3-yl)methanol (1:1)
((3R,4R)-4-(4-Fluorophenyl)-1-methylpiperidin-3-yl)methanol compound with ((3S,4S)-4-(4-fluorophenyl)-1-methylpiperidin-3-yl)methanol (1:1)
Catalogue No.:PA 16 08790
CAS :
NA
Molecular Formula : C13H18FNO
Molecular Weight : 223.29

![Phenyl (3R,4S)-3-((benzo[d][1,3]dioxol-5-yloxy)met PAI 16 006090](https://www.pharmaffiliates.com/pimages/PAI16006090.jpg)
Phenyl (3R,4S)-3-((benzo[d][1,3]dioxol-5-yloxy)methyl)-4-(4-fluorophenyl)piperidine-1-carboxylate
Phenyl (3R,4S)-3-((benzo[d][1,3]dioxol-5-yloxy)methyl)-4-(4-fluorophenyl)piperidine-1-carboxylate
Catalogue No.:PAI 16 006090
CAS :
NA
Molecular Formula : C26H24FNO5
Molecular Weight : 449.48

![(3S,4R)-3-((Benzo[d][1,3]dioxol-5-yloxy)methyl)-4- PA 16 0081001](https://www.pharmaffiliates.com/pimages/PA160081001.jpg)
(3S,4R)-3-((Benzo[d][1,3]dioxol-5-yloxy)methyl)-4-(4'-fluoro-[1,1'-biphenyl]-3-yl)piperidine methanesulfonate
(3S,4R)-3-((Benzo[d][1,3]dioxol-5-yloxy)methyl)-4-(4'-fluoro-[1,1'-biphenyl]-3-yl)piperidine methanesulfonate
Catalogue No.:PA 16 0081001
CAS :
NA
Molecular Formula : C26H28FNO6S
Molecular Weight : 501.57


(R,Z)-(1-(Hexa-3,5-dien-1-yl)-4-(4-methoxyphenyl)-1,2,3,6-tetrahydropyridin-3-yl)methanol (2R,3R)-2-(benzoyloxy)-3-(((Z)-pent-3-enoyl)oxy)succinate
(R,Z)-(1-(Hexa-3,5-dien-1-yl)-4-(4-methoxyphenyl)-1,2,3,6-tetrahydropyridin-3-yl)methanol (2R,3R)-2-(benzoyloxy)-3-(((Z)-pent-3-enoyl)oxy)succinate
Catalogue No.:PAI 16 006093
CAS :
NA
Molecular Formula : C35H41NO10
Molecular Weight : 635.71

![(3R,4S)-3-((Benzo[d][1,3]dioxol-5-yloxy)methyl)-4- PA 16 0071007](https://www.pharmaffiliates.com/pimages/PA160071007.jpg)
(3R,4S)-3-((Benzo[d][1,3]dioxol-5-yloxy)methyl)-4-(4-methoxyphenyl)piperidine Hydrochloride
(3R,4S)-3-((Benzo[d][1,3]dioxol-5-yloxy)methyl)-4-(4-methoxyphenyl)piperidine Hydrochloride
Catalogue No.:PA 16 0071007
CAS :
3060802-36-7
Molecular Formula : C20H24ClNO4
Molecular Weight : 377.87


(6-(((3R,4R)-4-(4-Fluorophenyl)piperidin-3-yl)methoxy)benzo[d][1,3]dioxol-4-yl)(6-(((3R,4S)-4-(4-fluorophenyl)piperidin-3-yl)methoxy)benzo[d][1,3]dioxol-4-yl)methane
(6-(((3R,4R)-4-(4-Fluorophenyl)piperidin-3-yl)methoxy)benzo[d][1,3]dioxol-4-yl)(6-(((3R,4S)-4-(4-fluorophenyl)piperidin-3-yl)methoxy)benzo[d][1,3]dioxol-4-yl)methane
Catalogue No.:PA 16 0071008
CAS :
NA
Molecular Formula : C39H40F2N2O6
Molecular Weight : 670.75


6,6'-bis(((3S,4R)-4-(4-Fluorophenyl)piperidin-3-yl)methoxy)-5,5'-bibenzo[d][1,3]dioxole Dihydrochloride
6,6'-bis(((3S,4R)-4-(4-Fluorophenyl)piperidin-3-yl)methoxy)-5,5'-bibenzo[d][1,3]dioxole Dihydrochloride
Catalogue No.:PA 16 0071009
CAS :
NA
Molecular Formula : C38H40Cl2F2N2O6
Molecular Weight : 729.64


Trans(-)-1-Methyl-3-[1,3-benzodioxol-5-yloxy)methyl]-4-(4-fluorophenyl)piperidine Hydrochloride
trans(-)-1-Methyl-3-[1,3-benzodioxol-5-yloxy)methyl]-4-(4-fluorophenyl)piperidine Hydrochloride
Catalogue No.:PA 16 0071011
CAS :
NA
Molecular Formula : C20H23ClFNO3
Molecular Weight : 379.86

![(3RS,4RS)-3-[(Benzodioxol-5-yloxy)methyl]-4-(4-flu PA 16 3061004](https://www.pharmaffiliates.com/pimages/PA163061004.jpg)
(3RS,4RS)-3-[(Benzodioxol-5-yloxy)methyl]-4-(4-fluorophenyl)piperidine hydrochloride); cis-paroxetine hydrochloride
(3RS,4RS)-3-[(Benzodioxol-5-yloxy)methyl]-4-(4-fluorophenyl)piperidine hydrochloride); cis-paroxetine hydrochloride
Catalogue No.:PA 16 3061004
CAS :
NA
Molecular Formula : C19H21ClFNO3
Molecular Weight : 365.83

![rel-(3R,4S)-3-((Benzo[d][1,3]dioxol-5-yloxy)methyl PA 16 0081003](https://www.pharmaffiliates.com/pimages/PA160081003.jpg)
rel-(3R,4S)-3-((Benzo[d][1,3]dioxol-5-yloxy)methyl)-4-(4'-fluoro-[1,1'-biphenyl]-4-yl)piperidine
rel-(3R,4S)-3-((Benzo[d][1,3]dioxol-5-yloxy)methyl)-4-(4'-fluoro-[1,1'-biphenyl]-4-yl)piperidine
Catalogue No.:PA 16 0081003
CAS :
1217975-87-5
Molecular Formula : C25H24FNO3
Molecular Weight : 405.47


1-(Tert-butyl) 3-ethyl 4-(((trifluoromethyl)sulfonyl)oxy)-5,6-dihydropyridine-1,3(2H)-dicarboxylate
1-(Tert-butyl) 3-ethyl 4-(((trifluoromethyl)sulfonyl)oxy)-5,6-dihydropyridine-1,3(2H)-dicarboxylate
Catalogue No.:PAI 16 306001
CAS :
176525-98-7
Molecular Formula : C14H20F3NO7S
Molecular Weight : 403.37