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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, Pantoprazole

Pantoprazole EP Impurity B

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CAS No.

: 102625-64-9

Mol F.

: C16H15F2N3O3S

Mol W.

: 367.37

Cat No.

: SA29102

Impurities, Pantoprazole

Pantoprazole EP Impurity C

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CAS No.

: 97963-62-7

Mol F.

: C8H6F2N2OS

Mol W.

: 216.21

Cat No.

: SA29103

Impurities, Pantoprazole

Pantoprazole EP Impurity D

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CAS No.

: 624742-53-6

Mol F.

: C17H17F2N3O4S

Mol W.

: 397.4

Cat No.

: SA29104

Impurities, Pantoprazole

Pantoprazole N-Methyl 5-Difluoromethoxy Thiol Impurity

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CAS No.

: NA

Mol F.

: C9H10N2OS

Mol W.

: 230.23

Cat No.

: SA29111

Impurities, Pantoprazole

Pantoprazole N-Methyl 6-Difluoromethoxy Thiol Impurity

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CAS No.

: NA

Mol F.

: C9H10N2OS

Mol W.

: 230.23

Cat No.

: SA29112

Impurities, Pantoprazole

Pantoprazole N-Oxide

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CAS No.

: 953787-60-5

Mol F.

: C16H15F2N3O5S

Mol W.

: 399.37

Cat No.

: SA29108

Impurities, Pantoprazole

Pantoprazole Sulfide N-Methyl 5-Difluoromethoxy Analog

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CAS No.

: NA

Mol F.

: C17H17F2N3O3S

Mol W.

: 381.4

Cat No.

: SA29109

Impurities, Pantoprazole

Pantoprazole Sulfide N-Methyl 6-Difluoromethoxy Analog

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CAS No.

: NA

Mol F.

: C17H17F2N3O3S

Mol W.

: 381.4

Cat No.

: SA29110

Impurities, Pantoprazole

Pantoprazole Sulfone N-Oxide

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CAS No.

: 953787-55-8

Mol F.

: C16H15F2N3O6S

Mol W.

: 415.37

Cat No.

: SA29107

Impurities, Paroxetine

Paroxetine Dimer N-Methyl Analog

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CAS No.

: NA

Mol F.

: C41H44F2N2O6

Mol W.

: 698.79

Cat No.

: SA18313

Impurities, Paroxetine

Paroxetine Hydrochloride

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CAS No.

: 78246-49-8

Mol F.

: C₁₉H₂₁ClFNO₃

Mol W.

: 365.83

Cat No.

: SA18314

Impurities, Paroxetine

Paroxetine Hydrochloride Anhydrous EP Impurity A

$550.00 25 mg

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CAS No.

: 1394842-91-1

Mol F.

: C19H21NO3

Mol W.

: 311.37

Cat No.

: SA18306

Impurities, Paroxetine

Paroxetine Hydrochloride Anhydrous EP Impurity B

$80.00 25 mg

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CAS No.

: 533-31-3

Mol F.

: C7H6O3

Mol W.

: 138.12

Cat No.

: SA18308

Impurities, Paroxetine

Paroxetine Hydrochloride Anhydrous EP Impurity F

$350.00 25 mg

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CAS No.

: 105813-39-6; 105813-40-9

Mol F.

: C26H27NO3

Mol W.

: 401.5

Cat No.

: SA18307

Impurities, Paroxetine

Paroxetine Hydrochloride Anhydrous EP Impurity J

$1,550.00 25 mg

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CAS No.

Mol F.

: C25H24FNO3

Mol W.

: 405.46

Cat No.

: SA18302

Impurities, Paroxetine

Paroxetine Hydrochloride Hemihydrate EP Impurity F

$1,550.00 25 mg

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CAS No.

: 606968-05-2

Mol F.

: C39H40F2N2O6

Mol W.

: 670.74

Cat No.

: SA18312

Impurities, Pazopanib

Pazopanib

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CAS No.

: 444731-52-6

Mol F.

: C21H23N7O2S

Mol W.

: 437.52

Cat No.

: SA51300

Impurities, Pazopanib

Pazopanib Chloro Impurity

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CAS No.

: 444731-75-3

Mol F.

: C14H14ClN5

Mol W.

: 287.75

Cat No.

: SA51311

Impurities, Pazopanib

Pazopanib Dimer

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CAS No.

: 2095544-42-4

Mol F.

: C42H43N13O4S2

Mol W.

: 858.01

Cat No.

: SA51304

Impurities, Pazopanib

Pazopanib Dimer Impurity

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CAS No.

: 1226499-98-4

Mol F.

: C22H22N8

Mol W.

: 398.5

Cat No.

: SA51308

Impurities, Pazopanib

Pazopanib Impurity 11

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CAS No.

: 1296888-47-5

Mol F.

: C15H17N5O

Mol W.

: 283.33

Cat No.

: SA51313

Impurities, Pazopanib

Pazopanib Impurity 17

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CAS No.

: 1821666-71-0

Mol F.

: C14H16N6

Mol W.

: 268.32

Cat No.

: SA51302

Impurities, Pazopanib

Pazopanib Impurity 19

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CAS No.

: 1821666-70-9

Mol F.

: C12H15N5O2S

Mol W.

: 293.3

Cat No.

: SA51303

Impurities, Pazopanib

Pazopanib Impurity 29

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CAS No.

: 1296888-46-4

Mol F.

: C16H20N6

Mol W.

: 296.4

Cat No.

: SA51305

Impurities, Pazopanib

Pazopanib Impurity 37

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CAS No.

: 1252927-45-9

Mol F.

: C14H14ClN5

Mol W.

: 287.75

Cat No.

: SA51301

Impurities, Pazopanib

Pazopanib Impurity 39

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CAS No.

: 1226499-97-3

Mol F.

: C13H12ClN5

Mol W.

: 273.7

Cat No.

: SA51307

Impurities, Pazopanib

Pazopanib impurity 8

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CAS No.

: 2795176-90-6

Mol F.

: C21H22N6O3S

Mol W.

: 438.51

Cat No.

: SA51309

Impurities, Pazopanib

Pazopanib N-oxide (RRT-0.70)

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CAS No.

Mol F.

: C21H23N7O3S

Mol W.

: 453.52

Cat No.

: SA51310

Impurities, Pazopanib

Pazopanib Pyrimidine Impurity

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CAS No.

: 444731-74-2

Mol F.

: C13H12ClN5

Mol W.

: 273.7

Cat No.

: SA51306

Impurities, Pemetrexed

Pemetrexed

$80.00 25 mg

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CAS No.

: 137281-23-3

Mol F.

: C20H21N5O6

Mol W.

: 427.41

Cat No.

: SA32301

Impurities, Pemetrexed

Pemetrexed 3-Oxo Diacid Impurity

$950.00 25 mg

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CAS No.

: 193281-05-9

Mol F.

: C19H21N5O7

Mol W.

: 431.4

Cat No.

: SA32313

Impurities, Pemetrexed

Pemetrexed 3-Oxo Dimethyl Ester

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CAS No.

: NA

Mol F.

: C21H25N5O7

Mol W.

: 459.45

Cat No.

: SA32315

Impurities, Pemetrexed

Pemetrexed Acid

$90.00 25 mg

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CAS No.

: 137281-39-1

Mol F.

: C15H14N4O3

Mol W.

: 298.3

Cat No.

: SA32300

Impurities, Pemetrexed

Pemetrexed Acid Methyl Ester

$80.00 25 mg

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CAS No.

: 155405-80-4

Mol F.

: C16H16N4O3

Mol W.

: 312.32

Cat No.

: SA32307

Impurities, Pemetrexed

Pemetrexed Diethyl Ester

$150.00 25 mg

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CAS No.

: 146943-43-3

Mol F.

: C24H29N5O6

Mol W.

: 483.52

Cat No.

: SA32308

Impurities, Pemetrexed

Pemetrexed Dihydro 6-Oxo Acid Methyl Ester

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CAS No.

: 1320346-43-7

Mol F.

: C16H16N4O4

Mol W.

: 328.32

Cat No.

: SA32317

Impurities, Pemetrexed

Pemetrexed EP Impurity A

$250.00 25 mg

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CAS No.

: 869791-42-4

Mol F.

: C21H23N5O6

Mol W.

: 441.44

Cat No.

: SA32302

Impurities, Pemetrexed

Pemetrexed EP Impurity B

$1,550.00 25 mg

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CAS No.

: 1802552-04-0

Mol F.

: C40H40N10O13

Mol W.

: 868.8

Cat No.

: SA32303

Impurities, Pemetrexed

Pemetrexed EP Impurity C

$1,850.00 25 mg

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CAS No.

: 1802552-16-4

Mol F.

: C40H40N10O13

Mol W.

: 868.8

Cat No.

: SA32304

Impurities, Ruxolitinib

Pemetrexed Keto impurity

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CAS No.

: 193281-00-4

Mol F.

: C22H25N5O7

Mol W.

: 471.46

Cat No.

: SA43400

Impurities, Pemetrexed

Pemetrexed N-Methyl Dimethyl Ester

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CAS No.

: NA

Mol F.

: C23H27N5O6

Mol W.

: 469.49

Cat No.

: SA32310

Impurities, Pemetrexed

Pemetrexed R-Isomer Diethyl Ester

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CAS No.

: NA

Mol F.

: C24H29N5O6

Mol W.

: 483.52

Cat No.

: SA32311

Impurities, Pemetrexed

Pemetrexed R-Isomer Dimethyl Ester

$395.00 25 mg

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CAS No.

: 1391068-12-4

Mol F.

: C22H25N5O6

Mol W.

: 455.46

Cat No.

: SA32312

Impurities, Pemetrexed

Pemetrexed α-Dipeptide Impurity

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CAS No.

: 883553-87-5

Mol F.

: C25H28N6O9

Mol W.

: 556.53

Cat No.

: SA32321

Impurities, Sofosbuvir

Pentafluoro Sofosbuvir Impurity

$100.00 10 mg

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CAS No.

: 1337529-56-2

Mol F.

: C18H17F5NO5P

Mol W.

: 453.3

Cat No.

: SA15441

Impurities, Sofosbuvir

Pentafluoro Sofosbuvir Impurity (SP-Isomer) | CAS : 1334513-02-8

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CAS No.

: 1334513-02-8

Mol F.

: C18H17F5NO5P

Mol W.

: 453.30

Cat No.

: SA15445

Impurities, Remdesivir

Pentafluorophenol

$100.00 100 mg

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CAS No.

: 771-61-9

Mol F.

: C6HF5O

Mol W.

: 184.06

Cat No.

: SA42731

Impurities, Pioglitazone

Pioglitazone | CAS : 111025-46-8

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CAS No.

: 111025-46-8

Mol F.

: C19H20N2O3S

Mol W.

: 356.4

Cat No.

: SA52800

Impurities, Pioglitazone

Pioglitazone 1-Hydroxyethyl Impurity | CAS : 146062-44-4

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CAS No.

: 146062-44-4

Mol F.

: C19H20N2O4S

Mol W.

: 372.4

Cat No.

: SA52819

Impurities, Pioglitazone

Pioglitazone 4-Hydroxybenzyl Impurity | 74772-78-4

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CAS No.

: 74772-78-4

Mol F.

: C10H9NO3S

Mol W.

: 223.2

Cat No.

: SA52822