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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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Diclofenac, Impurities

Diclofenac Carboxylic Acid

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CAS No.

: 13625-57-5

Mol F.

: C13H9Cl2NO2

Mol W.

: 282.12

Cat No.

: SA12705

Diclofenac, Impurities

Diclofenac Dimer Impurity

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CAS No.

: 1609187-32-7

Mol F.

: C₂₈H₂₀Cl₄N₂O₄

Mol W.

: 590.2

Cat No.

: SA12712

Diclofenac, Impurities

Diclofenac EP Impurity D

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CAS No.

: 127792-45-4

Mol F.

: C₁₄H₁₀BrClNNaO₂

Mol W.

: 362.58

Cat No.

: SA12711

Diclofenac, Impurities

Diclofenac Impurity C

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CAS No.

: 27204-57-5

Mol F.

: C13H11Cl2NO

Mol W.

: 268.14

Cat No.

: SA12706

Diclofenac, Impurities

Diclofenac Sodium

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CAS No.

: 15307-79-6

Mol F.

: C14H10Cl2NNaO2

Mol W.

: 318.13

Cat No.

: SA12701

Impurities, Nebivolol

Didefluoro Nebivolol

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CAS No.

: 129101-33-3

Mol F.

: C22H27NO4

Mol W.

: 369.45

Cat No.

: SA14706

Impurities, Pioglitazone

Didehydro-Hydroxy Pioglitazone Impurity | CAS : 646519-84-8

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CAS No.

: 646519-84-8

Mol F.

: C19H18N2O4S

Mol W.

: 370.4

Cat No.

: SA52823

Impurities, Tolterodine

Didesisopropyl Tolterodine

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CAS No.

: 1189501-90-3

Mol F.

: C16H19NO

Mol W.

: 241.33

Cat No.

: SA28217

Cariprazine, Impurities

Didesmethyl 2,3-Dichlorophenyl Cariprazine

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CAS No.

: 839712-25-3 (base); 1231947-92-4(HCl salt)

Mol F.

: C19H28Cl2N4O

Mol W.

: 399.36

Cat No.

: SA39707

Donepezil, Impurities

Didesmethyl Donepezil Impurity

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CAS No.

: 220170-71-8(Base)

Mol F.

: C22H26BrNO3

Mol W.

: 432.35

Cat No.

: SA34306

Impurities, Zolmitriptan

Didesmethyl Zolmitriptan

$695.00 50 mg

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CAS No.

: 139264-15-6

Mol F.

: C₁₄H₁₇N₃O₂

Mol W.

: 259.3

Cat No.

: SA11902

Dienogest, Impurities

Dienogest

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CAS No.

: 65928-58-7

Mol F.

: C₂₀H₂₅NO₂

Mol W.

: 311.42

Cat No.

: SA13800

Dienogest, Impurities

Dienogest EP Impurity K

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CAS No.

: 106111-43-7

Mol F.

: C₂₀H₂₅NO₄

Mol W.

: 343.42

Cat No.

: SA13811

Dienogest, Impurities

Dienogest Impurity A

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CAS No.

: 86153-39-1 (11β-Hydroxy)

Mol F.

: C20H25NO3

Mol W.

: 327.43

Cat No.

: SA13801

Dienogest, Impurities

Dienogest Impurity B

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CAS No.

: 5173-46-6

Mol F.

: C18H22O2

Mol W.

: 270.37

Cat No.

: SA13802

Dienogest, Impurities

Dienogest Impurity C

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CAS No.

: 106111-42-6

Mol F.

: C20H25NO2

Mol W.

: 311.42

Cat No.

: SA13803

Dienogest, Impurities

Dienogest Impurity D

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CAS No.

: 190662-30-7

Mol F.

: C₂₂H₂₉NO₃

Mol W.

: 355.47

Cat No.

: SA13804

Dienogest, Impurities

Dienogest Impurity E

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CAS No.

: 102193-41-9

Mol F.

: C22H31NO3

Mol W.

: 357.49

Cat No.

: SA13805

Dienogest, Impurities

Dienogest Impurity F

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CAS No.

: 67473-36-3

Mol F.

: C20H27NO2

Mol W.

: 313.44

Cat No.

: SA13806

Dienogest, Impurities

Dienogest Impurity G

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CAS No.

: 86153-38-0

Mol F.

: C₂₀H₂₃NO₂

Mol W.

: 309.4

Cat No.

: SA13807

Dienogest, Impurities

Dienogest Impurity H

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CAS No.

: 16669-06-0

Mol F.

: C20H23NO2

Mol W.

: 309.41

Cat No.

: SA13808

Dienogest, Impurities

Dienogest Impurity I

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CAS No.

: 65928-65-6

Mol F.

: C20H27NO2

Mol W.

: 313.44

Cat No.

: SA13809

Dienogest, Impurities

Dienogest Impurity J

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CAS No.

: 24284-84-2

Mol F.

: C21H27NO2

Mol W.

: 325.45

Cat No.

: SA13810

Dienogest, Impurities

Dienogest Impurity L

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CAS No.

: 5571-36-8

Mol F.

: C20H26O3

Mol W.

: 314.43

Cat No.

: SA13812

Dienogest, Impurities

Dienogest Impurity M

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CAS No.

: 98149-13-4

Mol F.

: C20H24BrNO2

Mol W.

: 390.32

Cat No.

: SA13813

Dolutegravir, Impurities

Diethyl 3-Bromo-4-oxo-1-(2-oxoethyl)-1,4-dihydropyridine-2,5-dicarboxylate

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CAS No.

: 1246616-77-2

Mol F.

: C13H14BrNO6

Mol W.

: 360.16

Cat No.

: SA20217

Impurities, Penciclovir

Diethyl Decarboxylted Impurity

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CAS No.

: NA

Mol F.

: C16H22ClN5O6

Mol W.

: 414.83

Cat No.

: SA27707

Impurities, Olmesartan Medoxomil

Diethyl-2-propylimidazole-4,5-dicarboxylate

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CAS No.

: 144689-94-1

Mol F.

: C12H18N2O4

Mol W.

: 254.28

Cat No.

: SA17737

Apixaban, Impurities

Diethyl1,4-bis(4-methoxyphenyl)-1,4-dihydro-1,2,4,5-tetrazine-3,6-dicarboxylate

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CAS No.

: 132679-97-1

Mol F.

: C22H24N4O6

Mol W.

: 440.45

Cat No.

: SA39964

Diflorasone Acetate, Impurities

Diflorasone 17-propionate

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CAS No.

: 924726-89-6

Mol F.

: C25H32F2O6

Mol W.

: 466.51

Cat No.

: SA44404

Gatifloxacin, Impurities

Difluoro Methoxy Gatifloxacin

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CAS No.

: 112811-72-0

Mol F.

: C14H11F2NO4

Mol W.

: 295.24

Cat No.

: SA37903

Difluoroprednisolone, Impurities

Difluprednate 11-Keto-17,21-diacetate Impurity

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CAS No.

Mol F.

: C25H28F2O7

Mol W.

: 478.48

Cat No.

: SA14216

Impurities, Prednisolone

Difluprednate Impurity 1

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CAS No.

Mol F.

: C27H35FO7

Mol W.

: 490.57

Cat No.

: SA16710

Difluoroprednisolone, Impurities

Difluprednate Impurity 13

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CAS No.

: 2326-26-3

Mol F.

: C23H26F2O5

Mol W.

: 420.45

Cat No.

: SA14215

Dapsone, Impurities

Diformyldapsone

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CAS No.

: 6784-25-4

Mol F.

: C14H12N2O4S

Mol W.

: 304.32

Cat No.

: SA27011

Donepezil, Impurities

Dihydro Donepezil Impurity

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CAS No.

: 120012-04-6

Mol F.

: C24H31NO3

Mol W.

: 381.51

Cat No.

: SA34313

Ibrutinib, Impurities

Dihydrodiol Ibrutinib Impurity

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CAS No.

: 1654820-87-7

Mol F.

: C25H26N6O4

Mol W.

: 474.51

Cat No.

: SA47413

Etravirine, Impurities

Dihydroxy Etravirine

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CAS No.

: 1246818-67-6

Mol F.

: C20H15BrN6O3

Mol W.

: 467.28

Cat No.

: SA26103

Impurities, Tiagabine

Dihydroxy Tiagabine

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CAS No.

Mol F.

: C20H27NO4S2

Mol W.

: 409.56

Cat No.

: SA10501

Impurities, Tiagabine

Dihydroxy Tiagabine (Mixture of Diastereomers)

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CAS No.

: 157925-28-5

Mol F.

: C₂₀H₂₇NO₄S₂

Mol W.

: 409.56

Cat No.

: SA10503

Diltiazem, Impurities

Diltiazem

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CAS No.

: 42399-41-7

Mol F.

: C22H26N2O4S

Mol W.

: 414.52

Cat No.

: SA19512

Diltiazem, Impurities

Diltiazem Impurity SA19521

$395.00 25 mg

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CAS No.

: 42399-48-4

Mol F.

: C16H17NO4S

Mol W.

: 319.38

Cat No.

: SA19521

Diltiazem, Impurities

Diltiazem Sulfoxide

$195.00 25 mg

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CAS No.

: 370094-12-5

Mol F.

: C22H26N2O5S

Mol W.

: 430.52

Cat No.

: SA19523

Impurities, Zidovudine

Dimer Zidovudine Impurity G

$995.00 25 mg

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CAS No.

: 148665-49-0

Mol F.

: C20H25N7O8

Mol W.

: 491.45

Cat No.

: SA12601

Ethisterone, Impurities

Dimethisterone

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CAS No.

: 79-64-1

Mol F.

: C₂₃H₃₂O₂

Mol W.

: 340.5

Cat No.

: SA12905

Dapagliflozin, Impurities

Dimethoxy Dapagliflozin Impurity

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CAS No.

Mol F.

: C23H29ClO8

Mol W.

: 468.92

Cat No.

: SA15058

Impurities, Riociguat

Dimethyl (6-amino-2-(1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl)pyrimidine-4,5-diyl)dicarbamate

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CAS No.

: 2708578-77-0

Mol F.

: C21H19FN8O4

Mol W.

: 466.4

Cat No.

: SA50814

Flurbiprofen, Impurities

dimethyl 2-(2-fluorobiphenyl-4-yl)-2,3-dimethylsuccinate

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CAS No.

: 42771-81-3

Mol F.

: C20H21FO4

Mol W.

: 344.38

Cat No.

: SA14608

Impurities, Nintedanib

Dimethyl 2-(3-amino-4-(methoxycarbonyl)phenyl)malonate

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CAS No.

Mol F.

: C13H15NO6

Mol W.

: 281.26

Cat No.

: SA22519

Aciclovir, Impurities

Dimethyl 2-[2-(2-amino-6-chloropurin-9-yl)ethyl]malonate

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CAS No.

: 172529-93-0

Mol F.

: C12H14ClN5O4

Mol W.

: 327.72

Cat No.

: SA21422