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Impurities

SynThink is a producer and supplier of a number of pharmaceutical Reference Standards (Impurity Standards) which are required for pharmaceutical companies to study quality, stability and biological safety of pharmaceutical products. Many API Impurities are available in our stock.

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Donepezil, Impurities

Didesmethyl Donepezil Impurity

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Out of Stock

CAS No.

: 220170-71-8(Base)

Mol F.

: C22H26BrNO3

Mol W.

: 432.35

Cat No.

: SA34306

Impurities, Zolmitriptan

Didesmethyl Zolmitriptan

Please enquire for price & pack size

Out of Stock

CAS No.

: 139264-15-6

Mol F.

: C₁₄H₁₇N₃O₂

Mol W.

: 259.3

Cat No.

: SA11902

Dienogest, Impurities

Dienogest

Please enquire for price & pack size

Out of Stock

CAS No.

: 65928-58-7

Mol F.

: C₂₀H₂₅NO₂

Mol W.

: 311.42

Cat No.

: SA13800

Dienogest, Impurities

Dienogest EP Impurity K

Please enquire for price & pack size

Out of Stock

CAS No.

: 106111-43-7

Mol F.

: C₂₀H₂₅NO₄

Mol W.

: 343.42

Cat No.

: SA13811

Dienogest, Impurities

Dienogest Impurity A

Please enquire for price & pack size

Out of Stock

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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Out of Stock

CAS No.

: 5173-46-6

Mol F.

: C18H22O2

Mol W.

: 270.37

Cat No.

: SA13802

Dienogest, Impurities

Dienogest Impurity C

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Out of Stock

CAS No.

: 106111-42-6

Mol F.

: C20H25NO2

Mol W.

: 311.42

Cat No.

: SA13803

Dienogest, Impurities

Dienogest Impurity D

Please enquire for price & pack size

Out of Stock

CAS No.

: 190662-30-7

Mol F.

: C₂₂H₂₉NO₃

Mol W.

: 355.47

Cat No.

: SA13804

Dienogest, Impurities

Dienogest Impurity E

Please enquire for price & pack size

Out of Stock

CAS No.

: 102193-41-9

Mol F.

: C22H31NO3

Mol W.

: 357.49

Cat No.

: SA13805

Dienogest, Impurities

Dienogest Impurity F

Please enquire for price & pack size

Out of Stock

CAS No.

: 67473-36-3

Mol F.

: C20H27NO2

Mol W.

: 313.44

Cat No.

: SA13806

Dienogest, Impurities

Dienogest Impurity G

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Out of Stock

CAS No.

: 86153-38-0

Mol F.

: C₂₀H₂₃NO₂

Mol W.

: 309.4

Cat No.

: SA13807

Dienogest, Impurities

Dienogest Impurity H

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Out of Stock

CAS No.

: 16669-06-0

Mol F.

: C20H23NO2

Mol W.

: 309.41

Cat No.

: SA13808

Dienogest, Impurities

Dienogest Impurity I

Please enquire for price & pack size

Out of Stock

CAS No.

: 65928-65-6

Mol F.

: C20H27NO2

Mol W.

: 313.44

Cat No.

: SA13809

Dienogest, Impurities

Dienogest Impurity J

Please enquire for price & pack size

Out of Stock

CAS No.

: 24284-84-2

Mol F.

: C21H27NO2

Mol W.

: 325.45

Cat No.

: SA13810

Dienogest, Impurities

Dienogest Impurity L

Please enquire for price & pack size

Out of Stock

CAS No.

: 5571-36-8

Mol F.

: C20H26O3

Mol W.

: 314.43

Cat No.

: SA13812

Dienogest, Impurities

Dienogest Impurity M

Please enquire for price & pack size

Out of Stock

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

Please enquire for price & pack size

Out of Stock

CAS No.

: 1246616-77-2

Mol F.

: C13H14BrNO6

Mol W.

: 360.16

Cat No.

: SA20217

Impurities, Penciclovir

Diethyl Decarboxylted Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C16H22ClN5O6

Mol W.

: 414.83

Cat No.

: SA27707

Impurities, Olmesartan Medoxomil

Diethyl-2-propylimidazole-4,5-dicarboxylate

Please enquire for price & pack size

Out of Stock

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

Please enquire for price & pack size

Out of Stock

CAS No.

: 132679-97-1

Mol F.

: C22H24N4O6

Mol W.

: 440.45

Cat No.

: SA39964

Diflorasone Acetate, Impurities

Diflorasone 17-propionate

Please enquire for price & pack size

Out of Stock

CAS No.

: 924726-89-6

Mol F.

: C25H32F2O6

Mol W.

: 466.51

Cat No.

: SA44404

Diflorasone Acetate, Impurities

Diflorasone 17-propionate-21-mesylate

Please enquire for price & pack size

Out of Stock

CAS No.

: 84509-92-2

Mol F.

: C26H34F2O8S

Mol W.

: 544.61

Cat No.

: SA44402

Gatifloxacin, Impurities

Difluoro Methoxy Gatifloxacin

Please enquire for price & pack size

Out of Stock

CAS No.

: 112811-72-0

Mol F.

: C14H11F2NO4

Mol W.

: 295.24

Cat No.

: SA37903

Difluoroprednisolone, Impurities

Difluprednate 11-Keto-17,21-diacetate Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C25H28F2O7

Mol W.

: 478.48

Cat No.

: SA14216

Impurities, Prednisolone

Difluprednate Impurity 1

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C27H35FO7

Mol W.

: 490.57

Cat No.

: SA16710

Difluoroprednisolone, Impurities

Difluprednate Impurity 13

Please enquire for price & pack size

Out of Stock

CAS No.

: 2326-26-3

Mol F.

: C23H26F2O5

Mol W.

: 420.45

Cat No.

: SA14215

Dapsone, Impurities

Diformyldapsone

Please enquire for price & pack size

Out of Stock

CAS No.

: 6784-25-4

Mol F.

: C14H12N2O4S

Mol W.

: 304.32

Cat No.

: SA27011

Donepezil, Impurities

Dihydro Donepezil Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 120012-04-6

Mol F.

: C24H31NO3

Mol W.

: 381.51

Cat No.

: SA34313

Ibrutinib, Impurities

Dihydrodiol Ibrutinib Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 1654820-87-7

Mol F.

: C25H26N6O4

Mol W.

: 474.51

Cat No.

: SA47413

Etravirine, Impurities

Dihydroxy Etravirine

Please enquire for price & pack size

Out of Stock

CAS No.

: 1246818-67-6

Mol F.

: C20H15BrN6O3

Mol W.

: 467.28

Cat No.

: SA26103

Impurities, Tiagabine

Dihydroxy Tiagabine

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C20H27NO4S2

Mol W.

: 409.56

Cat No.

: SA10501

Impurities, Tiagabine

Dihydroxy Tiagabine (Mixture of Diastereomers)

Please enquire for price & pack size

Out of Stock

CAS No.

: 157925-28-5

Mol F.

: C₂₀H₂₇NO₄S₂

Mol W.

: 409.56

Cat No.

: SA10503

Amoxicillin, Impurities

Diketopiperazine -1 Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

Mol W.

Cat No.

: SA15306

Amoxicillin, Impurities

Diketopiperazine -2 Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

Mol W.

Cat No.

: SA15307

Diltiazem, Impurities

Diltiazem

Please enquire for price & pack size

Out of Stock

CAS No.

: 42399-41-7

Mol F.

: C22H26N2O4S

Mol W.

: 414.52

Cat No.

: SA19512

Diltiazem, Impurities

Diltiazem Impurity SA19521

$395.00 25 mg

Out of Stock

CAS No.

: 42399-48-4

Mol F.

: C16H17NO4S

Mol W.

: 319.38

Cat No.

: SA19521

Diltiazem, Impurities

Diltiazem Sulfoxide

$195.00 25 mg

Out of Stock

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

Out of Stock

CAS No.

: 148665-49-0

Mol F.

: C20H25N7O8

Mol W.

: 491.45

Cat No.

: SA12601

Ethisterone, Impurities

Dimethisterone

Please enquire for price & pack size

Out of Stock

CAS No.

: 79-64-1

Mol F.

: C₂₃H₃₂O₂

Mol W.

: 340.5

Cat No.

: SA12905

Dapagliflozin, Impurities

Dimethoxy Dapagliflozin Impurity

Please enquire for price & pack size

Out of Stock

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

Please enquire for price & pack size

Out of Stock

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

Please enquire for price & pack size

Out of Stock

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

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C13H15NO6

Mol W.

Cat No.

: SA22519

Aciclovir, Impurities

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

Please enquire for price & pack size

Out of Stock

CAS No.

: 172529-93-0

Mol F.

: C12H14ClN5O4

Mol W.

: 327.72

Cat No.

: SA21422

Impurities, Vericiguat

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

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C21H18F2N8O4

Mol W.

: 484.42

Cat No.

: SA50712

Impurities, Omeprazole

Dimethyl Sulfate

Please enquire for price & pack size

Out of Stock

CAS No.

: 77-78-1

Mol F.

: C2H6O4S

Mol W.

: 126.13

Cat No.

: SA19403

Fingolimod, Impurities

Dimethylamino Fingolimod Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 1404433-87-9

Mol F.

: C21H38ClNO2

Mol W.

: 371.98

Cat No.

: SA34513

Impurities, Tolterodine

Diol acetate tolterodine impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 2514856-06-3

Mol F.

: C18H20O3

Mol W.

: 284.35000000000002

Cat No.

: SA28212

Diphenhydramine, Impurities

Diphenhydramine

Please enquire for price & pack size

Out of Stock

CAS No.

: 147-24-0(HCl); 58-73-1(Base)

Mol F.

: C17H22ClNO

Mol W.

: 291.82

Cat No.

: SA19801

Diphenhydramine, Impurities

Diphenhydramine Related Compoud A

Please enquire for price & pack size

Out of Stock

CAS No.

: 53499-40-4(HCl); 17471-10-2(Base)

Mol F.

: C16H19NO.HCl

Mol W.

: 277.79

Cat No.

: SA19802