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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, Palbociclib

Palbociclib Succinic Acid Adduct

Please enquire for price & pack size

In Stock

CAS No.

: 1974279-21-4

Mol F.

: C28H33N7O5

Mol W.

: 547.6

Cat No.

: SA40439

Paroxetine

Paroxetine Hydrochloride Anhydrous EP Impurity C; N-Benzyl Paroxetine

$155.00 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

Paroxetine

Paroxetine Hydrochloride Anhydrous EP Impurity G

$90.00 25 mg

In Stock

CAS No.

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

Mol F.

: C12H14FN

Mol W.

: 191.24

Cat No.

: SA18310

Paroxetine

Paroxetine Hydrochloride Anhydrous EP Impurity H

$195.00 25 mg

In Stock

CAS No.

: 201855-60-9

Mol F.

: C₁₉H₂₂FNO

Mol W.

: 299.38

Cat No.

: SA18304

Paroxetine

Paroxetine Hydrochloride Anhydrous EP Impurity I

$99.00 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

Paroxetine

Paroxetine Hydrochloride Hemihydrate EP Impurity B; 4-Methoxy Paroxetine Hydrochloride

$295.00 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

Paroxetine

Paroxetine Hydrochloride Hemihydrate EP Impurity C

$295.00 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

Pemetrexed

Pemetrexed 6-Oxo Diacid Impurity; Pemetrexed Keto Impurity

$450.00 25 mg

In Stock

CAS No.

: 193281-00-4

Mol F.

: C22H25N5O7

Mol W.

: 443.41

Cat No.

: SA32314

Pemetrexed

Pemetrexed 6-Oxo Diethyl ester

$225.00 10 mg

In Stock

CAS No.

Mol F.

: C24H29N5O7

Mol W.

: 499.52

Cat No.

: SA32324

Pemetrexed

Pemetrexed 6-Oxo Dimethyl Ester

$225.00 10 mg

In Stock

CAS No.

: 1320346-45-9

Mol F.

: C20H21N5O7

Mol W.

: 471.46

Cat No.

: SA32316

Pemetrexed

Pemetrexed Diacid DMF Adduct

$295.00 25 mg

In Stock

CAS No.

Mol F.

: C23H26N6O6

Mol W.

: 482.49

Cat No.

: SA32325

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

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

Pemetrexed

Pemetrexed Monomethyl Ester 1; Pemetrexed Impurity 3; Pemetrexed-1-methyl Ester

$295.00 25 mg

In Stock

CAS No.

: 1265908-63-1

Mol F.

: C21H23N5O6

Mol W.

: 441.44

Cat No.

: SA32318

Pemetrexed

Pemetrexed Monomethyl Ester 2; Pemetrexed Sodium 5-Methyl Ester

$295.00 25 mg

In Stock

CAS No.

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

Mol F.

: C21H23N5O6

Mol W.

: 441.44

Cat No.

: SA32319

Penciclovir

Penciclovir API

$195.00 1 g

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, Neomycin

Penta N-Boc-Neomycin Sulfate Impurity E

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In Stock

CAS No.

Mol F.

: C48H85N5O24

Mol W.

: 1116.21

Cat No.

: SA51411

Impurities, Permethrin

Permethrin (API) CAS : 52645-53-1

Please enquire for price & pack size

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

Pitavastatin

Pitavastatin (3R,5R)-Isomer

$195.00 10 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

Pitavastatin

Pitavastatin (3S,5R)-Isomer

$295.00 25 mg

In Stock

CAS No.

: 254452-88-5

Mol F.

: C25H23FNO4 . 1/2Ca

Mol W.

: 420.45

Cat No.

: SA29502

Pitavastatin

Pitavastatin (3S,5S)-Isomer

$255.00 10 mg

In Stock

CAS No.

: 254452-92-1

Mol F.

: C25H23FNO4 . 1/2Ca

Mol W.

: 420.45

Cat No.

: SA29503

Pitavastatin

Pitavastatin (Z)-Isomer

$155.00 10 mg

In Stock

CAS No.

: 1159588-21-2

Mol F.

: C25H23FNO4

Mol W.

: 420.45

Cat No.

: SA29505

Pitavastatin

Pitavastatin 5-Oxo Acid

$195.00 10 mg

In Stock

CAS No.

: 222306-15-2

Mol F.

: C25H22FNO4

Mol W.

: 419.44

Cat No.

: SA29519

Pitavastatin

Pitavastatin Desfluoro

$225.00 10 mg

In Stock

CAS No.

: 847849-67-6(acid)

Mol F.

: C25H25NO4

Mol W.

: 403.47

Cat No.

: SA29506

Pitavastatin

Pitavastatin Lactone

$110.00 25 mg

In Stock

CAS No.

: 141750-63-2

Mol F.

: C25H22FNO3

Mol W.

: 403.45

Cat No.

: SA29515

Pitavastatin

Pitavastatin Methyl Ester

$125.00 25 mg

In Stock

CAS No.

: 849811-78-5

Mol F.

: C26H26FNO4

Mol W.

: 435.49

Cat No.

: SA29512

Pitavastatin

Pitavastatin t-Butyl Ester

$99.00 25 mg

In Stock

CAS No.

: 586966-54-3

Mol F.

: C₂₉H₃₂FNO₄

Mol W.

: 477.57

Cat No.

: SA29514

Pemetrexed

PMD-Diester DMF Complex; Pemetrexed diethylester N,N-dimethylformamidine

$295.00 25 mg

In Stock

CAS No.

: 1802552-05-1

Mol F.

: C27H34N6O6

Mol W.

: 538.6

Cat No.

: SA32323

Pemetrexed

PMT-1 – 1.03 RRT impurity; Pemetrexed Impurity 50

$280.00 25 mg

In Stock

CAS No.

: 1265908-62-0

Mol F.

: C28H34N6O9

Mol W.

: 598.6

Cat No.

: SA32320

Impurities, Praziquantel

Praziquantel Related Compound A

$200.00 25 mg

In Stock

CAS No.

: 54761-87-4

Mol F.

: C19H18N2O2

Mol W.

: 306.36

Cat No.

: SA13901

Impurities, Praziquantel

Praziquantel Related Compound B

$200.00 25 mg

In Stock

CAS No.

: 125273-86-1

Mol F.

: C19H22N2O2

Mol W.

: 310.39

Cat No.

: SA13902

Impurities, Praziquantel

Praziquantel Related Compound C

$200.00 25 mg

In Stock

CAS No.

: 125273-88-3

Mol F.

: C19H22N2O4

Mol W.

: 342.39

Cat No.

: SA13903

Impurities, Prazosin

Prazosin EP Impurity B

Please enquire for price & pack size

In Stock

CAS No.

: 31350-27-3

Mol F.

: C14H14N2O4

Mol W.

: 274.27

Cat No.

: SA24201

Impurities, Prednisolone

Prednisolone

Please enquire for price & pack size

In Stock

CAS No.

: 50-24-8

Mol F.

: C21H28O5

Mol W.

: 360.44

Cat No.

: SA16701

Impurities, Prednisolone

Prednisolone 17,21-Diacetate

$195.00 25 mg

In Stock

CAS No.

: 17652-24-3

Mol F.

: C25H32O7

Mol W.

: 444.52

Cat No.

: SA16717

Impurities, Loteprednol

Prednisolone 20-Ethyl Ester

Please enquire for price & pack size

In Stock

CAS No.

: 182069-19-8

Mol F.

: C25H34O7

Mol W.

: 446.53

Cat No.

: SA27609

Prednisolone

Prednisolone Acetate EP Impurity C (Prednisolone Diacetate)

$175.00 25 mg

In Stock

CAS No.

: 98523-85-4

Mol F.

: C25H32O7

Mol W.

: 444.53

Cat No.

: SA16711

Impurities, Prednisolone

Prednisolone Acetate EP Impurity E (Deltacortinene Acetate)

$175.00 25 mg

In Stock

CAS No.

: 4380-55-6

Mol F.

: C23H28O5

Mol W.

: 384.48

Cat No.

: SA16713

Impurities, Prednisolone

Prednisolone Acetate Impurity (Deltoxenol)

$195.00 25 mg

In Stock

CAS No.

: 20423-99-8

Mol F.

: C21H28O4

Mol W.

: 344.45

Cat No.

: SA16712

Impurities, Loteprednol

Prednisolone dicarbonate

Please enquire for price & pack size

In Stock

CAS No.

: 133991-62-5

Mol F.

: C26H34O9

Mol W.

: 490.54

Cat No.

: SA27610

Impurities, Prednisolone

Prednisolone EP Impurity F

$495.00 25 mg

In Stock

CAS No.

: 600-90-8

Mol F.

: C21H28O5

Mol W.

: 360.45

Cat No.

: SA16708

Impurities, Prednisolone

Prednisolone-17-acetate

$195.00 25 mg

In Stock

CAS No.

: 52628-64-5

Mol F.

: C23H30O6

Mol W.

: 402.48

Cat No.

: SA16714

Impurities, Prednisolone

Prednisolone-17-Valarate

$295.00 25 mg

In Stock

CAS No.

: 15180-00-4

Mol F.

: C26H36O6

Mol W.

: 444.56

Cat No.

: SA16716