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Impurities

SynThink is a trusted producer and supplier of Pharmaceutical Reference Standards, including Impurity Standards. These materials are essential for pharmaceutical companies conducting research into the quality, stability, and biological safety of drug products. We maintain a robust inventory of API impurities, ready to support your development and regulatory needs.

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Impurities, Prucalopride

Prucalopride-N-Oxide

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CAS No.

: 1900715-98-1

Mol F.

: C18H26ClN3O4

Mol W.

: 383.87

Cat No.

: SA43101

Impurities, Niacin

Pyridine

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CAS No.

: 110-86-1

Mol F.

: C5H5N

Mol W.

: 79.099999999999994

Cat No.

: SA33106

Donepezil, Impurities

Pyridine Dehydro Donepezil Impurity

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CAS No.

: 4803-74-1

Mol F.

: C17H15NO3

Mol W.

: 281.31

Cat No.

: SA34316

Donepezil, Impurities

Pyridine Dehydro N-Oxide Donepezil Impurity

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CAS No.

: 896134-06-8

Mol F.

: C17H15NO4

Mol W.

: 297.31

Cat No.

: SA34314

Donepezil, Impurities

Pyridine N-Oxide Donepezil

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CAS No.

: 896134-07-9

Mol F.

: C17H17NO4

Mol W.

: 299.32

Cat No.

: SA34315

Impurities, Palbociclib

Pyridine N-Oxide Palbociclib

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CAS No.

: 2098673-40-4

Mol F.

: C24H29N7O3

Mol W.

: 464.53

Cat No.

: SA40405

Impurities, Pyrrolidine

Pyrrolidine

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CAS No.

: 123-75-1

Mol F.

: C4H9N

Mol W.

: 71.11

Cat No.

: SA49400

Impurities, Quetiapine

Quetiapine EP Impurity A

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CAS No.

: 844639-07-2

Mol F.

: C23H27N3O3S

Mol W.

: 425.54

Cat No.

: SA13007

Impurities, Quetiapine

Quetiapine EP Impurity B

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CAS No.

: 5747-48-8

Mol F.

: C17H17N3S

Mol W.

: 295.41

Cat No.

: SA13003

Impurities, Quetiapine

Quetiapine EP impurity C

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CAS No.

: 1798840-31-9

Mol F.

: C40H42N6O3S2

Mol W.

: 718.95

Cat No.

: SA13008

Impurities, Quetiapine

Quetiapine EP Impurity D

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CAS No.

: 945668-94-0

Mol F.

: C30H24N4S2

Mol W.

: 504.67

Cat No.

: SA13006

Impurities, Quetiapine

Quetiapine EP Impurity E

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CAS No.

: 1371638-05-9

Mol F.

: C40H44N6O2S2

Mol W.

: 704.95

Cat No.

: SA13009

Impurities, Quetiapine

Quetiapine EP impurity F

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CAS No.

: 848814-27-7

Mol F.

: C₂₁H₂₇N₃O₃S

Mol W.

: 401.52

Cat No.

: SA13010

Impurities, Quetiapine

Quetiapine EP Impurity G

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CAS No.

: 3159-07-7

Mol F.

: C13H9NOS

Mol W.

: 227.28

Cat No.

: SA13001

Impurities, Quetiapine

Quetiapine EP Impurity I

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CAS No.

: 329216-67-3

Mol F.

: C19H21N3OS

Mol W.

: 339.45

Cat No.

: SA13005

Impurities, Quetiapine

Quetiapine EP Impurity J

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CAS No.

: 1356906-17-6

Mol F.

: C25H33N3O4S

Mol W.

: 471.61

Cat No.

: SA13011

Impurities, Quetiapine

Quetiapine EP Impurity K

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CAS No.

: 1371638-10-6

Mol F.

: C23H29N3O4S

Mol W.

: 443.56

Cat No.

: SA13012

Impurities, Quetiapine

Quetiapine EP Impurity L

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CAS No.

: 1371638-11-7

Mol F.

: C21H24ClN3O2S

Mol W.

: 417.95

Cat No.

: SA13013

Impurities, Quetiapine

Quetiapine EP Impurity N

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CAS No.

: 1800291-86-4

Mol F.

: C27H37N5O2S

Mol W.

: 495.68

Cat No.

: SA13014

Impurities, Quetiapine

Quetiapine EP Impurity O

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CAS No.

: 844639-06-1

Mol F.

: C40H39N3O2S

Mol W.

: 625.82

Cat No.

: SA13015

Impurities, Quetiapine

Quetiapine EP Impurity P

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CAS No.

: 1011758-03-4

Mol F.

: C19H21N3S

Mol W.

: 323.46

Cat No.

: SA13016

Impurities, Quetiapine

Quetiapine EP Impurity Q

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CAS No.

Mol F.

: C25H34N3O4S

Mol W.

: 472.62

Cat No.

: SA13017

Impurities, Quetiapine

Quetiapine EP Impurity R

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CAS No.

: 2459-05-4

Mol F.

: C6H8O4

Mol W.

: 144.13

Cat No.

: SA13018

Impurities, Quetiapine

Quetiapine EP Impurity S

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CAS No.

: 329216-63-9

Mol F.

: C21H25N3O3S

Mol W.

: 399.51

Cat No.

: SA13019

Impurities, Quetiapine

Quetiapine EP Impurity T

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CAS No.

: 5747-46-6

Mol F.

: C17H16N2OS

Mol W.

: 296.39

Cat No.

: SA13020

Impurities, Quetiapine

Quetiapine EP Impurity U

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CAS No.

: 5786-26-5

Mol F.

: C13H10N2S

Mol W.

: 226.3

Cat No.

: SA13021

Impurities, Quetiapine

Quetiapine EP Impurity V

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CAS No.

: 2204369-14-0(Base)

Mol F.

: C21H25N3O2

Mol W.

: 351.44

Cat No.

: SA13022

Impurities, Quetiapine

Quetiapine EP Impurity W

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CAS No.

: 1800608-95-0

Mol F.

: C34H32N4O2S2

Mol W.

: 592.77

Cat No.

: SA13023

Impurities, Quetiapine

Quetiapine HEEP Impurity

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CAS No.

: 13349-82-1

Mol F.

: C8H18N2O2

Mol W.

: 174.24

Cat No.

: SA13002

Impurities, Quetiapine

Quetiapine N-Oxide

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CAS No.

: 1076199-40-0

Mol F.

: C21H25N3O3S

Mol W.

: 399.51

Cat No.

: SA13004

Impurities, Manidipine

R-(-)-Manidipine

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CAS No.

: 133082-19-6

Mol F.

: C₃₅H₃₈N₄O₆

Mol W.

: 610.7

Cat No.

: SA29802

Impurities, Topiramate

R-Hydroxy Topiramate

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CAS No.

: 198215-60-0

Mol F.

: C12H21NO9S

Mol W.

: 355.36

Cat No.

: SA45515

Impurities, Nitrosamine

rac 1-Nitroso-2-methylindoline

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CAS No.

: 85440-79-5

Mol F.

: C9H10N2O

Mol W.

: 162.19

Cat No.

: SA44640

Atomoxetine, Impurities

rac 3-Chloro-1-phenyl-1-(2-methylphenoxy)propane

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CAS No.

: 881995-47-7

Mol F.

: C16H17ClO

Mol W.

: 260.76

Cat No.

: SA22122

Impurities, Pregabalin

rac 4,5-Dehydro Pregabalin

$250.00 25 mg

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CAS No.

: 216576-74-8

Mol F.

: C8H15NO2

Mol W.

: 157.21

Cat No.

: SA24804

Impurities, Pregabalin

rac 5,6-Dehydro Pregabalin

$995.00 25 mg

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CAS No.

: 1136478-30-2

Mol F.

: C8H15NO2

Mol W.

: 157.21

Cat No.

: SA24805

Impurities, Propranolol

rac 7-Methoxy Propranolol

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CAS No.

: 76275-53-1

Mol F.

: C17H23NO3

Mol W.

: 289.37

Cat No.

: SA24607

Efavirenz, Impurities

Rac Efavirenz Benzoyl Amino Alcohol (USP)

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CAS No.

: 1189491-03-9

Mol F.

: C21H17ClF3NO3

Mol W.

: 423.81

Cat No.

: SA17602

Efavirenz, Impurities

rac Methyl Efavirenz

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CAS No.

: 353270-76-5

Mol F.

: C₁₅H₁₁ClF₃NO₂

Mol W.

: 329.7

Cat No.

: SA17609

Impurities, Nebivolol

rac N-Benzyl Nebivolol

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CAS No.

: 929706-85-4

Mol F.

: C29H31F2NO4

Mol W.

: 495.56

Cat No.

: SA14705

Impurities, Venlafaxine

rac N-Boc-N,O-Didesmethyl Venlafaxine 2,3,4-Tri-O-acetyl-β-D-glucuronide Methyl Este

$2,555.00 50 mg

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CAS No.

Mol F.

: C33H47NO13

Mol W.

: 665.72

Cat No.

: SA22722

Impurities, Venlafaxine

rac N-Desmethyl-N-(4-methoxyphenethyl) Venlafaxine

$895.00 50 mg

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CAS No.

: 1346601-14-6

Mol F.

: C25H35NO3

Mol W.

: 397.55

Cat No.

: SA22724

Dapoxetine, Impurities

rac N-Didemethyl Dapoxetine

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CAS No.

: 119357-34-5

Mol F.

Mol W.

: C19H19NO

Cat No.

: SA23011

Atomoxetine, Impurities

rac N-Methyl Atomoxetine Oxalate

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CAS No.

: 107688-86-8

Mol F.

: C18H23NO.C2H2O4

Mol W.

: 269.38/90.03

Cat No.

: SA22118

Impurities, Venlafaxine

rac N,N-Didesmethyl-N-(4-hydroxyphenethyl)-O-desmethyl Venlafaxine

$1,555.00 100 mg

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CAS No.

: 1346601-21-5

Mol F.

: C22H29NO3

Mol W.

: 355.47

Cat No.

: SA22727

Impurities, Venlafaxine

rac N,N-Didesmethyl-O-desmethyl Venlafaxine 2,3,4-Tri-O-acetyl-β-D-glucuronide Methyl Este

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CAS No.

Mol F.

: C27H37NO11

Mol W.

: 551.58

Cat No.

: SA22732

Impurities, Nebivolol

rac Nebivolol Hydrochloride

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CAS No.

: 169293-50-9

Mol F.

: C22H26ClF2NO4

Mol W.

: 441.9

Cat No.

: SA14704

Carbamazepine, Impurities

rac trans-10,11-Dihydro-10,11-dihydroxy Carbamazepine

$395.00 25 mg

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CAS No.

: 58955-93-4

Mol F.

: C15H14N2O3

Mol W.

: 270.28

Cat No.

: SA20318

Impurities, Praziquantel

rac-1,2,3,6,7,11b-Hexahydro-2-[(4-oxocyclohexyl)carbonyl]-4H-pyrazino[2,1-a]isoquinolin-4-one

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CAS No.

: 57452-32-1

Mol F.

: C19H22N2O3

Mol W.

: 326.39

Cat No.

: SA13904

Impurities, Nicotine

rac-2-Amino Nicotine

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CAS No.

: 32726-84-4

Mol F.

: C₁₀H₁₅N₃

Mol W.

: 177.25

Cat No.

: SA32209