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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, Sulfamethoxazole

Sulfamethoxazole EP Impurity D

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CAS No.

: 121-57-3

Mol F.

: C6H7NO3S

Mol W.

: 173.19

Cat No.

: SA25503

Impurities, Sulfamethoxazole

Sulfamethoxazole EP Impurity E

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CAS No.

: 63-74-1

Mol F.

: C6H8N2O2S

Mol W.

: 172.2

Cat No.

: SA25504

Impurities, Sulfamethoxazole

Sulfamethoxazole EP Impurity F

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CAS No.

: 17103-52-5

Mol F.

: C10H11N3O3S

Mol W.

: 253.28

Cat No.

: SA25505

Impurities, Mesalamine

Sulfanilazosalicylic Acid | CAS : 1912438-05-1

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CAS No.

: 1912438-05-1

Mol F.

: C13H10N2O5S

Mol W.

: 306.3

Cat No.

: SA21319

Impurities, Sulpiride

Sulpiride

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CAS No.

: 15676-16-1

Mol F.

: C15H23N3O4S

Mol W.

: 341.43

Cat No.

: SA10900

Impurities, Sulpiride

Sulpiride EP impurity A

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CAS No.

: 26116-12-1

Mol F.

: C7H17N2

Mol W.

: 129.22

Cat No.

: SA10901

Impurities, Sulpiride

Sulpiride EP impurity C

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CAS No.

: 33045-53-3

Mol F.

: C10H13NO5S

Mol W.

: 259.28

Cat No.

: SA10903

Impurities, Sulpiride

Sulpiride EP impurity E

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CAS No.

: 52395-25-2

Mol F.

: C8H10N2O4S

Mol W.

: 230.24

Cat No.

: SA10905

Impurities, Sulpiride

Sulpiride EP impurity F

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CAS No.

: 2214214-03-4

Mol F.

: C15H23N3O5S

Mol W.

: 357.43

Cat No.

: SA10906

Impurities, Sulpiride

Sulpiride EP impurity G

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CAS No.

: 67381-52-6

Mol F.

: C14H22N3O4S

Mol W.

: 327.41

Cat No.

: SA10907

Impurities, Sumatriptan

Sumatriptan

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CAS No.

: 103628-46-2

Mol F.

: C₁₄H₂₁N₃O₂S

Mol W.

: 295.39999999999998

Cat No.

: SA34800

Impurities, Sumatriptan

Sumatriptan 3-Hydroxy-2-Oxo Impurity

$1,155.00 25 mg

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CAS No.

: 2250254-19-2

Mol F.

: C14H21N3O4S

Mol W.

: 327.4

Cat No.

: SA34810

Impurities, Sumatriptan

Sumatriptan 5-Hydroxymethyl Impurity

$185.00 25 mg

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CAS No.

: 334981-08-7

Mol F.

: C13H18N2O

Mol W.

: 218.29

Cat No.

: SA34815

Impurities, Sumatriptan

Sumatriptan Aminophenyl Impurity

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CAS No.

: 109903-35-7

Mol F.

: C8H12N2O2S

Mol W.

: 200.26

Cat No.

: SA34811

Impurities, Sumatriptan

Sumatriptan Carboxylic Acid Impurity

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CAS No.

: 103628-44-0

Mol F.

: C12H14N2O4S

Mol W.

: 282.32

Cat No.

: SA34809

Impurities, Sumatriptan

Sumatriptan Cyanomethyl Impurity

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CAS No.

: 88918-76-7

Mol F.

: C12H13N3O2S

Mol W.

: 263.32

Cat No.

: SA34814

Impurities, Sumatriptan

Sumatriptan Dimethylamino Impurity

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CAS No.

: 19718-92-4

Mol F.

: C8H19NO2

Mol W.

: 161.24

Cat No.

: SA34816

Impurities, Sumatriptan

Sumatriptan EP Impurity F

$295.00 25 mg

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CAS No.

: 2074615-63-5

Mol F.

: C13H17N3O2S

Mol W.

: 279.36

Cat No.

: SA34806

Impurities, Sumatriptan

Sumatriptan EP Impurity G

$295.00 25 mg

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CAS No.

: 2074614-56-3

Mol F.

: C14H19N3O2S

Mol W.

: 293.38

Cat No.

: SA34807

Impurities, Sumatriptan

Sumatriptan EP Impurity H

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CAS No.

: 1391052-59-7

Mol F.

: C27H37N5O2S

Mol W.

: 495.68

Cat No.

: SA34808

Impurities, Sumatriptan

Sumatriptan Formyl Indole Impurity

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CAS No.

: NA

Mol F.

: C11H12N2O3S

Mol W.

: 252.29

Cat No.

: SA34820

Impurities, Sumatriptan

Sumatriptan Hydrazine Impurity

$95.00 25 mg

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CAS No.

: 88933-16-8(HClsalt);139272-29-0(base)

Mol F.

: C8H14ClN3O2S

Mol W.

: 251.73

Cat No.

: SA34812

Impurities, Sumatriptan

Sumatriptan Hydroxy Pyrroloindole Impurity

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CAS No.

: NA

Mol F.

: C14H22ClN3O3S

Mol W.

: 347.86

Cat No.

: SA34819

Impurities, Sumatriptan

Sumatriptan Succinate

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CAS No.

: 103628-48-4

Mol F.

: C18H27N3O6S

Mol W.

: 413.49

Cat No.

: SA34813

Impurities, Sunitinib

Sunitinib

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CAS No.

: 557795-19-4

Mol F.

: C22H27FN4O2

Mol W.

: 398.47

Cat No.

: SA39600

Impurities, Sunitinib

Sunitinib Aldehyde Impurity

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CAS No.

: 356068-86-5

Mol F.

: C14H23N3O2

Mol W.

: 265.35

Cat No.

: SA39608

Impurities, Sunitinib

Sunitinib Amide Impurity

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CAS No.

: 1186651-51-3

Mol F.

: C†H„FNƒO‚

Mol W.

: 299.3

Cat No.

: SA39607

Impurities, Sunitinib

Sunitinib Carboxylic Acid

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CAS No.

: 452105-33-8

Mol F.

: C16H13FN2O3

Mol W.

: 300.28

Cat No.

: SA39606

Impurities, Sunitinib

Sunitinib Ketone Impurity

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CAS No.

: 2411816-47-0

Mol F.

: C22H25FN4O3

Mol W.

: 412.46

Cat No.

: SA39605

Impurities, Sunitinib

Sunitinib N-Desethyl Impurity

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CAS No.

: 356068-97-8

Mol F.

: C20H23FN4O2

Mol W.

: 370.42

Cat No.

: SA39610

Impurities, Sunitinib

Sunitinib N-Oxide

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CAS No.

: 356068-99-0

Mol F.

: C22H27FN4O3

Mol W.

: 414.47

Cat No.

: SA39609

Impurities, Sunitinib

Sunitinib N,N-Didesethyl Impurity

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CAS No.

: 1217216-61-9

Mol F.

: C18H20ClFN4O2

Mol W.

: 378.83

Cat No.

: SA39604

Impurities, Sunitinib

Sunitinib N,N-Didesethyl N-Butoxycarbonyl Impurity

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CAS No.

: 1227960-76-0

Mol F.

: C23H27FN4O4

Mol W.

: 442.48

Cat No.

: SA39603

Impurities, Sunitinib

Sunitinib N,N-Dimethyl

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CAS No.

: 326914-17-4

Mol F.

: C20H23FN4O2

Mol W.

: 370.42

Cat No.

: SA39602

Impurities, Norgestimate

syn/anti-6β-Hydroxynorgestimate

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CAS No.

: 108434-19-1

Mol F.

: C23H31NO4

Mol W.

: C23H31NO4

Cat No.

: SA15901

Impurities, Levothyroxine

T4-Formic Acid-N-methylamide

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CAS No.

: 2088032-78-2

Mol F.

: C14H9I4NO3

Mol W.

: 746.84

Cat No.

: SA24728

Impurities, Tadalafil

Tadalafil

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CAS No.

: 171596-29-5

Mol F.

: C22H19N3O4

Mol W.

: 389.4

Cat No.

: SA20900

Impurities, Tadalafil

Tadalafil Acid Impurity | CAS : 474668-76-3

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CAS No.

: 474668-76-3

Mol F.

: C19H17ClN2O4

Mol W.

: 372.81

Cat No.

: SA20916

Impurities, Tadalafil

Tadalafil Lactose Adduct

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CAS No.

: NA

Mol F.

: C34H39N3O14

Mol W.

: 713.68

Cat No.

: SA20913

Impurities, Tadalafil

Tadalafil N-Hydroxy Methyl impurity

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CAS No.

: NA

Mol F.

: C23H21N3O5

Mol W.

: 419.43

Cat No.

: SA20912

Impurities, Tadalafil

Tadalafil β D-Glucuronide

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CAS No.

: NA

Mol F.

: C28H29N3O9

Mol W.

: 551.54

Cat No.

: SA20914

Impurities, Tenofovir alafenamide

TAF Methyl Regio Isomer Impurity-SP

$1,995.00 100 mg

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CAS No.

Mol F.

: C21H29N6O5P

Mol W.

: 476.47

Cat No.

: SA42421

Impurities, Tenofovir alafenamide

TAF-PMPA-Isopropyl alaninate

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CAS No.

: 851456-00-3

Mol F.

: C15H25N6O5P

Mol W.

: 400.38

Cat No.

: SA36931

Impurities, Tamoxifen

Tamoxifen

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CAS No.

: 10540-29-1

Mol F.

: C26H29NO

Mol W.

: 371.51

Cat No.

: SA35500

Impurities, Tamoxifen

Tamoxifen (E)-Isomer; Cis-Tamoxifen

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CAS No.

: 13002-65-8

Mol F.

: C26H29NO

Mol W.

: 371.51

Cat No.

: SA35501

Impurities, Tamoxifen

Tamoxifen Amine Dimer

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CAS No.

: 1346606-51-6

Mol F.

: C49H49NO2

Mol W.

: 683.92

Cat No.

: SA35509

Impurities, Tamoxifen

Tamoxifen Citrate

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CAS No.

: 54965-24-1

Mol F.

: C32H37NO8

Mol W.

: 563.64

Cat No.

: SA35510

Impurities, Tamoxifen

Tamoxifen Des Ethyl Impurity

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CAS No.

: 19957-51-8

Mol F.

: C24H25NO

Mol W.

: 343.46

Cat No.

: SA35503

Impurities, Tamoxifen

Tamoxifen EP Impurity H

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CAS No.

: 809285-09-4

Mol F.

: C43H48N2O2

Mol W.

: 624.85

Cat No.

: SA35508

Impurities, Tamoxifen

Tamoxifen Hydroxyl Impurity

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CAS No.

: 748-97-0

Mol F.

: C26H31NO2

Mol W.

: 389.53

Cat No.

: SA35502