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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, Omeprazole

Omeprazole EP Impurity H

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In Stock

CAS No.

: 863029-89-4

Mol F.

: C16H16ClN3O2S

Mol W.

: 349.84

Cat No.

: SA19414

Dapagliflozin, Impurities

Ortho-Isomer of Dapagliflozin

$195.00 10 mg

In Stock

CAS No.

: 2040305-05-1

Mol F.

: C21H25ClO6

Mol W.

: 408.87

Cat No.

: SA15041

Impurities, Losartan

OTB-tetrazole aldoxime

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In Stock

CAS No.

: NA

Mol F.

: C14H11N5O

Mol W.

: 265.27

Cat No.

: SA26728

Eslicarbazepine, Impurities

Oxcarbazepine

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In Stock

CAS No.

: 28721-07-5

Mol F.

: C15H12N2O2

Mol W.

: 252.27

Cat No.

: SA28805

Impurities, Oxcarbazepine

Oxcarbazepine EP Impurity C

$95.00 25 mg

In Stock

CAS No.

: 21737-58-6

Mol F.

: C14H11NO

Mol W.

: 209.24

Cat No.

: SA12505

Impurities, Oxcarbazepine

Oxcarbazepine EP Impurity D; Dibenzazepinodione

$255.00 25 mg

In Stock

CAS No.

: 19579-83-0

Mol F.

: C14H9NO2

Mol W.

: 223.23

Cat No.

: SA12507

Impurities, Oxcarbazepine

Oxcarbazepine EP Impurity F

$125.00 25 mg

In Stock

CAS No.

: 28721-08-6

Mol F.

: C16H12ClNO2

Mol W.

: 285.72

Cat No.

: SA12506

Impurities, Oxcarbazepine

Oxcarbazepine EP Impurity H

$95.00 25 mg

In Stock

CAS No.

: 4698-11-7

Mol F.

: C15H13NO

Mol W.

: 223.27

Cat No.

: SA12509

Impurities, Oxcarbazepine

Oxcarbazepine EP Impurity L

$195.00 25 mg

In Stock

CAS No.

: 2642430-28-0

Mol F.

: C17H14N2O3

Mol W.

: 294.3

Cat No.

: SA12511

Impurities, Oxcarbazepine

Oxcarbazepine EP Impurity M; Oxcarbazepine Dimer

$655.00 25 mg

In Stock

CAS No.

: 2642430-32-6

Mol F.

: C30H22N4O3

Mol W.

: 486.52

Cat No.

: SA12512

Impurities, Oxymetazoline

Oxymetazoline EP Impurity B

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In Stock

CAS No.

: 1218-35-5

Mol F.

: C16H25ClN2

Mol W.

: 280.84

Cat No.

: SA44202

Impurities, Oxymetazoline

Oxymetazoline EP Impurity C

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In Stock

CAS No.

: 55699-13-3

Mol F.

: C14H21NO2

Mol W.

: 235.3

Cat No.

: SA44203

Impurities, Oxymetazoline

Oxymetazoline EP Impurity D

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In Stock

CAS No.

: 55699-12-2

Mol F.

: C14H20O3

Mol W.

: 236.3

Cat No.

: SA44204

Impurities, Oxymetazoline

Oxymetazoline EP Impurity E

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In Stock

CAS No.

: 55699-10-0

Mol F.

: C14H19NO

Mol W.

: 217.31

Cat No.

: SA44205

Ezetimibe, Impurities

P-Fluoro oxazolidone

$80.00 25 mg

In Stock

CAS No.

: 189028-93-1

Mol F.

: C20H18FNO4

Mol W.

: 355.36

Cat No.

: SA14843

Impurities, Palbociclib

Palbociclib Acetyl BOC impurity

Please enquire for price & pack size

In Stock

CAS No.

: 1651214-74-2

Mol F.

: C29H37N7O4

Mol W.

: 547.7

Cat No.

: SA40428

Impurities, Palbociclib

Palbociclib Succinic Acid Adduct

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In Stock

CAS No.

: 1974279-21-4

Mol F.

: C28H33N7O5

Mol W.

: 547.6

Cat No.

: SA40439

Impurities, Paroxetine

Paroxetine Hydrochloride Anhydrous EP Impurity C

$195.00 25 mg

In Stock

CAS No.

: 105813-14-7

Mol F.

: C₂₆H₂₆FNO₃

Mol W.

: 419.49

Cat No.

: SA18303

Impurities, Paroxetine

Paroxetine Hydrochloride Anhydrous EP Impurity D

$195.00 25 mg

In Stock

CAS No.

: 130855-30-0; 112058-85-2

Mol F.

: C19H20FNO3

Mol W.

: 329.36

Cat No.

: SA18309

Impurities, Paroxetine

Paroxetine Hydrochloride Anhydrous EP Impurity G

$150.00 25 mg

In Stock

CAS No.

: 69675-10-1; 1012886-75-7

Mol F.

: C12H14FN

Mol W.

: 191.24

Cat No.

: SA18310

Impurities, Paroxetine

Paroxetine Hydrochloride Anhydrous EP Impurity H

$250.00 25 mg

In Stock

CAS No.

: 201855-60-9

Mol F.

: C₁₉H₂₂FNO

Mol W.

: 299.38

Cat No.

: SA18304

Impurities, Paroxetine

Paroxetine Hydrochloride Anhydrous EP Impurity I

$120.00 25 mg

In Stock

CAS No.

: 125224-43-3 (base); 188869-26-3 (trans base); 220548-73-2 (HCl)

Mol F.

: C12H16FNO

Mol W.

: 209.26

Cat No.

: SA18311

Impurities, Paroxetine

Paroxetine Hydrochloride Hemihydrate EP Impurity B

$495.00 25 mg

In Stock

CAS No.

: 127017-74-7; 127017-69-0 (free base)

Mol F.

: C20H23NO4.HCl

Mol W.

: 377.86

Cat No.

: SA18300

Impurities, Paroxetine

Paroxetine Hydrochloride Hemihydrate EP Impurity C

$350.00 25 mg

In Stock

CAS No.

: 1395408-54-4; 1346597-97-4 (HCl Salt); 606968-04-1 (base)

Mol F.

: C21H25NO4. HCl

Mol W.

: 391.9

Cat No.

: SA18301

Impurities, Pemetrexed

Pemetrexed 6-Oxo Diacid Impurity

$450.00 25 mg

In Stock

CAS No.

: 193281-00-4

Mol F.

: C22H25N5O7

Mol W.

: 443.41

Cat No.

: SA32314

Impurities, Pemetrexed

Pemetrexed 6-Oxo Diethyl ester

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In Stock

CAS No.

Mol F.

: C24H29N5O7

Mol W.

: 499.52

Cat No.

: SA32324

Impurities, Pemetrexed

Pemetrexed 6-Oxo Dimethyl Ester

Please enquire for price & pack size

In Stock

CAS No.

: 1320346-45-9

Mol F.

: C20H21N5O7

Mol W.

: 443.41

Cat No.

: SA32316

Impurities, Pemetrexed

Pemetrexed Dimethyl Ester

$150.00 25 mg

In Stock

CAS No.

: 155405-81-5

Mol F.

: C22H25N5O6

Mol W.

: 455.46

Cat No.

: SA32309

Impurities, Pemetrexed

Pemetrexed EP Impurity D

$195.00 10 mg

In Stock

CAS No.

: 144051-68-3; 1265908-59-5 (Trisodium salt)

Mol F.

: C25H28N6O9

Mol W.

: 556.52

Cat No.

: SA32305

Impurities, Pemetrexed

Pemetrexed EP Impurity E

$185.00 25 mg

In Stock

CAS No.

: 182009-04-7

Mol F.

: C20H19N5Na2O6

Mol W.

: 471.37

Cat No.

: SA32306

Impurities, Pemetrexed

Pemetrexed Monomethyl Ester 1

$295.00 25 mg

In Stock

CAS No.

: 1265908-63-1

Mol F.

: C21H23N5O6

Mol W.

: 441.44

Cat No.

: SA32318

Impurities, Pemetrexed

Pemetrexed Monomethyl Ester 2

$495.00 25 mg

In Stock

CAS No.

: 1265908-60-8; 1265908-64-2

Mol F.

: C21H23N5O6

Mol W.

: 441.44

Cat No.

: SA32319

Impurities, Penciclovir

Penciclovir API

Please enquire for price & pack size

In Stock

CAS No.

: 39809-25-1

Mol F.

: C10H15N5O3

Mol W.

: 253.26

Cat No.

: SA27711

Impurities, Penciclovir

Penciclovir Diacetate; Penciclovir Impurity C

$155.00 25 mg

In Stock

CAS No.

: 97845-72-2

Mol F.

: C14H19N5O5

Mol W.

: 337.33

Cat No.

: SA27705

Impurities, Permethrin

Permethrin (API) CAS : 52645-53-1

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In Stock

CAS No.

: 52645-53-1

Mol F.

: C21H20Cl2O3

Mol W.

: 391.29

Cat No.

: SA51900

Apixaban, Impurities

Phenylamino Carboxylic Acid Apixaban Impurity

$95.00 25 mg

In Stock

CAS No.

: 1704504-93-7

Mol F.

: C20H18N4O4

Mol W.

: 378.38

Cat No.

: SA39912

Apixaban, Impurities

Phenylamino Carboxylic Ethyl Ester Apixaban Impurity

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C22H20N4O4

Mol W.

: 404.42

Cat No.

: SA39911

Apixaban, Impurities

Phenylamino Carboxylic Methyl Ester Apixaban Impurity

$95.00 25 mg

In Stock

CAS No.

: 1466571-07-2

Mol F.

: C21H20N4O4

Mol W.

: 392.41

Cat No.

: SA39913

Impurities, Nintedanib

Piperazine Nintedanib Dimer

$345.00 25 mg

In Stock

CAS No.

: 2410284-90-9

Mol F.

: C56H52N8O8

Mol W.

: 965.06

Cat No.

: SA22512

Impurities, Linagliptin

Piperidin-3-amine dihydrochloride

Please enquire for price & pack size

In Stock

CAS No.

: 138060-07-8

Mol F.

: C5H14Cl2N2

Mol W.

: 173.08

Cat No.

: SA49929

Impurities, Pitavastatin

Pitavastatin (3R,5R)-Isomer

$295.00 25 mg

In Stock

CAS No.

: 254452-96-5 (calcium salt); 769908-13-6 (acid)

Mol F.

: C25H23FNO4.1/2Ca

Mol W.

: 420.45

Cat No.

: SA29501

Impurities, Pitavastatin

Pitavastatin (3S,5R)-Isomer

$950.00 25 mg

In Stock

CAS No.

: 254452-88-5

Mol F.

: C25H23FNO4 . 1/2Ca

Mol W.

: 420.45

Cat No.

: SA29502

Impurities, Pitavastatin

Pitavastatin (3S,5S)-Isomer

$695.00 25 mg

In Stock

CAS No.

: 254452-92-1

Mol F.

: C25H23FNO4 . 1/2Ca

Mol W.

: 420.45

Cat No.

: SA29503

Impurities, Pitavastatin

Pitavastatin (Z)-Isomer

$250.00 25 mg

In Stock

CAS No.

: 1159588-21-2

Mol F.

: C25H23FNO4

Mol W.

: 420.45

Cat No.

: SA29505

Impurities, Pitavastatin

Pitavastatin 5-Oxo Acid

$495.00 25 mg

In Stock

CAS No.

: 222306-15-2

Mol F.

: C25H22FNO4

Mol W.

: 419.44

Cat No.

: SA29519

Impurities, Pitavastatin

Pitavastatin Desfluoro

$850.00 25 mg

In Stock

CAS No.

: 847849-67-6(acid)

Mol F.

: C25H25NO4

Mol W.

: 403.47

Cat No.

: SA29506

Impurities, Pitavastatin

Pitavastatin Lactone

$110.00 25 mg

In Stock

CAS No.

: 141750-63-2

Mol F.

: C25H22FNO3

Mol W.

: 403.45

Cat No.

: SA29515

Impurities, Pitavastatin

Pitavastatin Methyl Ester

$170.00 25 mg

In Stock

CAS No.

: 849811-78-5

Mol F.

: C26H26FNO4

Mol W.

: 435.49

Cat No.

: SA29512

Impurities, Pitavastatin

Pitavastatin t-Butyl Ester

$150.00 25 mg

In Stock

CAS No.

: 586966-54-3

Mol F.

: C₂₉H₃₂FNO₄

Mol W.

: 477.57

Cat No.

: SA29514

Impurities, Pemetrexed

PMD-Diacid DMF Complex

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C23H26N6O6

Mol W.

: 482.49

Cat No.

: SA32325