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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, 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

Impurities, Vericiguat

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

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CAS No.

Mol F.

: C21H18F2N8O4

Mol W.

: 484.42

Cat No.

: SA50712

Impurities, Omeprazole

Dimethyl Sulfate

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CAS No.

: 77-78-1

Mol F.

: C2H6O4S

Mol W.

: 126.13

Cat No.

: SA19403

Fingolimod, Impurities

Dimethylamino Fingolimod Impurity

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CAS No.

: 1404433-87-9

Mol F.

: C21H38ClNO2

Mol W.

: 371.98

Cat No.

: SA34513

Impurities, Tolterodine

Diol acetate tolterodine impurity

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CAS No.

: 2514856-06-3

Mol F.

: C18H20O3

Mol W.

: 284.35000000000002

Cat No.

: SA28212

Diphenhydramine, Impurities

Diphenhydramine

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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

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CAS No.

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

Mol F.

: C16H19NO.HCl

Mol W.

: 277.79

Cat No.

: SA19802

Dipyridamole, Impurities

Dipyridamole

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CAS No.

: 58-32-2

Mol F.

: C24H40N8O4

Mol W.

: 504.63

Cat No.

: SA38900

Dipyridamole, Impurities

Dipyridamole EP Impurity A

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CAS No.

: 16982-40-4

Mol F.

: C‚…H„€NˆO‚

Mol W.

: 484.64

Cat No.

: SA38901

Dipyridamole, Impurities

Dipyridamole EP Impurity B

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CAS No.

: 16908-47-7

Mol F.

: C‚ƒH„€NˆO†

Mol W.

: 524.61

Cat No.

: SA38902

Dipyridamole, Impurities

Dipyridamole EP Impurity C

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CAS No.

: 54093-92-4

Mol F.

: C‚€Hƒ€ClN‡O‚

Mol W.

: 435.95

Cat No.

: SA38903

Dipyridamole, Impurities

Dipyridamole EP Impurity D

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CAS No.

: 1176886-12-6

Mol F.

: C22H36N8O3

Mol W.

: 460.57

Cat No.

: SA38904

Dipyridamole, Impurities

Dipyridamole EP Impurity E

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CAS No.

: 2365420-11-5

Mol F.

: C24H40N8O4

Mol W.

: 504.63

Cat No.

: SA38905

Dipyridamole, Impurities

Dipyridamole EP Impurity F

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CAS No.

: 60286-30-8

Mol F.

: C21H36N8O5

Mol W.

: 480.56

Cat No.

: SA38906

Dipyridamole, Impurities

Dipyridamole EP Impurity G

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CAS No.

: 1913545

Mol F.

: C16H20N2O

Mol W.

: 367.27

Cat No.

: SA38907

Dolutegravir, Impurities

Dolutegravir O-Methyl 12-Epi Impurity

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CAS No.

: NA

Mol F.

: C21H21F2N3O5

Mol W.

: 433.41

Cat No.

: SA20204

Dolutegravir, Impurities

Dolutegravir O-Methyl Enantiomer Impurity

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CAS No.

: NA

Mol F.

: C21H21F2N3O5

Mol W.

: 433.41

Cat No.

: SA20205

Dolutegravir, Impurities

Dolutegravir RR Isomer

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CAS No.

: 1357289-29-2

Mol F.

: C20H19F2N3O5

Mol W.

: 419.38

Cat No.

: SA20207

Dolutegravir, Impurities

Dolutegravir Sodium Salt

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CAS No.

: 1051375-19-9

Mol F.

: C20H18F2N3NaO5

Mol W.

: 441.36

Cat No.

: SA20206

Dolutegravir, Impurities

Dolutegravir SR Isomer

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CAS No.

: 1309560-49-3

Mol F.

: C20H19F2N3O5

Mol W.

: 419.38

Cat No.

: SA20208

Donepezil, Impurities

Donepezil

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CAS No.

: 120014-06-4

Mol F.

: C₂₄H₂₉NO₃

Mol W.

: 379.49

Cat No.

: SA34302

Dorzolamide, Impurities

Dorzolamide EP Impurity A

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CAS No.

: 120279-95-0 (base); 122028-36-8 (HCl salt)

Mol F.

: C10H16N2O4S3

Mol W.

: 324.44

Cat No.

: SA24116

Dorzolamide, Impurities

Dorzolamide EP Impurity C

$695.00 25 mg

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CAS No.

Mol F.

: C10H17BN2O6S3

Mol W.

: 368.26

Cat No.

: SA24103

Dorzolamide, Impurities

Dorzolamide Hydrochloride

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CAS No.

: 130693-82-2

Mol F.

: C10H17ClN2O4S3

Mol W.

: 360.9

Cat No.

: SA24105

Dorzolamide, Impurities

Dorzolamide N-Sulfonamide Dimer

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CAS No.

: 199734-72-0

Mol F.

: C20H29N2O8S6

Mol W.

: 631.85

Cat No.

: SA24118

Impurities, Prazosin

Doxazosin EP Impurity D

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CAS No.

: 28888-44-0

Mol F.

: C10H10N2O4

Mol W.

: 222.2

Cat No.

: SA24205

Doxepin, Impurities

Doxepin

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CAS No.

: 1229-29-4

Mol F.

: C19H21NO

Mol W.

: 279.38

Cat No.

: SA29900