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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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Sofosbuvir

Sofosbuvir Impurity SA15434; Sofosbuvir metabolites

$395.00 10 mg

In Stock

CAS No.

: 1859162-80-3

Mol F.

: C16H18FN2O8P

Mol W.

: 416.29

Cat No.

: SA15434

Impurities, Sofosbuvir

Sofosbuvir Impurity SA15435

$695.00 25 mg

In Stock

CAS No.

Mol F.

: C31H26ClN3O7

Mol W.

: 588.01

Cat No.

: SA15435

Sofosbuvir

Sofosbuvir α-isomer

$255.00 10 mg

In Stock

CAS No.

Mol F.

: C22H29FN3O9P

Mol W.

: 529.46

Cat No.

: SA15402

Edoxaban

SRR Boc-Cyclohexyl Enantiomer of Edoxaban

Please enquire for price & pack size

In Stock

CAS No.

: 2089454-69-1

Mol F.

: C14H27N3O3

Mol W.

: 285.38

Cat No.

: SA33017

Ezetimibe, Impurities

SRR uncyclized ezetimibe impurity

$250.00 25 mg

In Stock

CAS No.

: 1621715-63-6

Mol F.

: C33H30F2N2O5

Mol W.

: 572.6

Cat No.

: SA14838

Ezetimibe, Impurities

SS-Ezetimibe Ketone

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C24H19F2NO3

Mol W.

: 407.41

Cat No.

: SA14857

Edoxaban, Impurities

SSR Boc-Cyclohexyl Diastereomer of Edoxaban

Please enquire for price & pack size

In Stock

CAS No.

: 2081883-50-1

Mol F.

: C14H27N3O3

Mol W.

: 285.39

Cat No.

: SA33022

Edoxaban

SSR-Edoxaban

Please enquire for price & pack size

In Stock

CAS No.

: 1255529-28-2

Mol F.

: C25H31ClN6O4S

Mol W.

: 547.07

Cat No.

: SA33002

Edoxaban, Impurities

SSS Boc-Cyclohexyl Diastereomer of Edoxaban

Please enquire for price & pack size

In Stock

CAS No.

: 2081883-52-3

Mol F.

: C14H27N3O3

Mol W.

: 285.39

Cat No.

: SA33023

Edoxaban, Impurities

SSS-Edoxaban

Please enquire for price & pack size

In Stock

CAS No.

: 1255529-27-1

Mol F.

: C24H32ClN7O4S

Mol W.

: 550.07

Cat No.

: SA33006

Impurities, Sulpiride

Sulpiride EP impurity D

Please enquire for price & pack size

In Stock

CAS No.

: 22117-85-7

Mol F.

: C8H9NO5S

Mol W.

: 231.23

Cat No.

: SA10904

Impurities, Sumatriptan

Sumatriptan EP Impurity A

$295.00 25 mg

In Stock

CAS No.

Mol F.

: C31H43N5O6S

Mol W.

: 613.77

Cat No.

: SA34801

Impurities, Sumatriptan

Sumatriptan EP Impurity B

$455.00 25 mg

In Stock

CAS No.

: 88919-51-1

Mol F.

: C13H19N3O2S

Mol W.

: 281.37

Cat No.

: SA34802

Impurities, Sumatriptan

Sumatriptan EP Impurity C

$195.00 25 mg

In Stock

CAS No.

: 1797905-62-4

Mol F.

: C15H23N3O3S

Mol W.

: 325.43

Cat No.

: SA34803

Impurities, Sumatriptan

Sumatriptan EP Impurity D

$155.00 25 mg

In Stock

CAS No.

: 212069-94-8

Mol F.

: C14H21N3O3S

Mol W.

: 311.40

Cat No.

: SA34804

Sumatriptan

Sumatriptan EP Impurity E

$115.00 25 mg

In Stock

CAS No.

: 88919-22-6

Mol F.

: C12H17N3O2S

Mol W.

: 267.35

Cat No.

: SA34805

Impurities, Tadalafil

Tadalafil EP Impurity A

Please enquire for price & pack size

In Stock

CAS No.

: 171596-27-3

Mol F.

: C₂₂H₁₉N₃O₄

Mol W.

: 389.4

Cat No.

: SA20909

Tadalafil

Tadalafil EP Impurity B

Please enquire for price & pack size

In Stock

CAS No.

: 629652-72-8

Mol F.

: C₂₂H₁₉N₃O₄

Mol W.

: 389.4

Cat No.

: SA20907

Tadalafil

Tadalafil EP Impurity C

Please enquire for price & pack size

In Stock

CAS No.

: 171596-28-4

Mol F.

: C₂₂H₁₉N₃O₄

Mol W.

: 389.4

Cat No.

: SA20908

Impurities, Nitrosamine, Tadalafil

Tadalafil Nitroso Impurity

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C22H18N4O5

Mol W.

: 418.4

Cat No.

: SA20915

Telmisartan

Telmisartan Benzimidazole Acid

$100.00 1 g

In Stock

CAS No.

: 152628-03-0

Mol F.

: C₁₂H₁₄N₂O₂

Mol W.

: 218.25

Cat No.

: SA33908

Telmisartan

Telmisartan Bromo Acid

$99.00 50 mg

In Stock

CAS No.

: 150766-86-2

Mol F.

: C14H11BrO2

Mol W.

: 289.99

Cat No.

: SA33909

Telmisartan

Telmisartan Bromo Methyl Ester

$99.00 100 mg

In Stock

CAS No.

: 114772-38-2

Mol F.

: C15H13BrO2

Mol W.

: 305.2

Cat No.

: SA33911

Telmisartan

Telmisartan DiBenzimidazole N-Desmethyl Impurity

$295.00 50 mg

In Stock

CAS No.

: 884330-09-0

Mol F.

: C18H18N4

Mol W.

: 290.15

Cat No.

: SA33918

Telmisartan

Telmisartan Dimer Impurity

$295.00 10 mg

In Stock

CAS No.

: 884330-14-7

Mol F.

: C₄₆H₃₈N₄O₄

Mol W.

: 710.82

Cat No.

: SA33920

Telmisartan

Telmisartan EP Impurity A

$125.00 100 mg

In Stock

CAS No.

: 152628-02-9

Mol F.

: C19H20N4

Mol W.

: 304.39

Cat No.

: SA33901

Telmisartan

Telmisartan EP Impurity B

$295.00 100 mg

In Stock

CAS No.

: 1026353-20-7

Mol F.

: C33H30N4O2

Mol W.

: 514.62

Cat No.

: SA33902

Telmisartan

Telmisartan EP Impurity C

$99.00 25 mg

In Stock

CAS No.

: 144702-26-1

Mol F.

: C37H38N4O2

Mol W.

: 570.72

Cat No.

: SA33903

Telmisartan

Telmisartan EP Impurity E

$99.00 25 mg

In Stock

CAS No.

: 884330-12-5

Mol F.

: C26H24N2O4

Mol W.

: 428.17

Cat No.

: SA33904

Telmisartan

Telmisartan EP Impurity F

$99.00 25 mg

In Stock

CAS No.

: 915124-86-6

Mol F.

: C33H31N5O

Mol W.

: 513.63

Cat No.

: SA33905

Telmisartan

Telmisartan EP Impurity G

$99.00 25 mg

In Stock

CAS No.

: 144702-27-2

Mol F.

: C33H29N5

Mol W.

: 495.24

Cat No.

: SA33906

Telmisartan

Telmisartan Ethyl Ester

$99.00 25 mg

In Stock

CAS No.

: 528560-94-3

Mol F.

: C35H34N4O2

Mol W.

: 542.67

Cat No.

: SA33915

Telmisartan

Telmisartan Methyl Ester

$99.00 25 mg

In Stock

CAS No.

: 528560-93-2

Mol F.

: C34H32N4O2

Mol W.

: 528.64

Cat No.

: SA33914

Impurities, Telmisartan

Telmisartan N-Desmethyl Impurity

$295.00 50 mg

In Stock

CAS No.

: 144701-81-5

Mol F.

: C32H28N4O2

Mol W.

: 500.22

Cat No.

: SA33917

Tenofovir

$80.00 25 mg

In Stock

CAS No.

: 147127-20-6

Mol F.

: C9H14N5O4P

Mol W.

: 287.21

Cat No.

: SA36900

Tenofovir

Tenofovir (R)-Isomer Monophenyl Ester Impurity

$125.00 1 g

In Stock

CAS No.

: 379270-35-6

Mol F.

: C15H18N5O4P

Mol W.

: 363.31

Cat No.

: SA42402

Tenofovir

Tenofovir (R)-Propanol Impurity

$95.00 25 mg

In Stock

CAS No.

: 14047-28-0

Mol F.

: C8H11N5O

Mol W.

: 193.21

Cat No.

: SA36920

Tenofovir

Tenofovir (s) Propanol Impurity

$95.00 25 mg

In Stock

CAS No.

: 14047-27-9

Mol F.

: C8H11N5O

Mol W.

: 193.1

Cat No.

: SA36925

Tenofovir

Tenofovir (S)-Isomer

$100.00 25 mg

In Stock

CAS No.

: 147127-19-3

Mol F.

: C9H14N5O4P

Mol W.

: 287.21

Cat No.

: SA36917

Tenofovir

Tenofovir (S)-Isomer Monophenyl Ester Impurity

$195.00 100 mg

In Stock

CAS No.

Mol F.

: C15H18N5O4P

Mol W.

: 363.31

Cat No.

: SA42403

Tenofovir

Tenofovir Adenine Impurity

$80.00 25 mg

In Stock

CAS No.

: 73-24-5

Mol F.

: C5H5N5

Mol W.

: 135.13

Cat No.

: SA36930

Tenofovir alafenamide

Tenofovir Alafenamide Enantiomer; Tenofovir Alafenamide SRR isomer

$255.00 5 mg

In Stock

CAS No.

: NA

Mol F.

: C21H29N6O5P

Mol W.

: 476.47

Cat No.

: SA42405

Tenofovir alafenamide

Tenofovir Alafenamide Impurity E

$195.00 25 mg

In Stock

CAS No.

: NA

Mol F.

: C18H24N5O4P

Mol W.

: 405.39

Cat No.

: SA42411

Tenofovir alafenamide

Tenofovir alafenamide Impurity G

$195.00 50 mg

In Stock

CAS No.

: 160616-04-6

Mol F.

: C15H26N5O4P

Mol W.

: 371.38

Cat No.

: SA42412

Tenofovir alafenamide

Tenofovir Alafenamide Methyl Ester Impurity

$155.00 5 mg

In Stock

CAS No.

: 390409-27-5

Mol F.

: C19H25N6P5O

Mol W.

: 448.16

Cat No.

: SA42406

Tenofovir alafenamide

Tenofovir Alafenamide Propyl Ester-RSS Isomer

$175.00 5 mg

In Stock

CAS No.

Mol F.

: C21H29N6O5P

Mol W.

: 476.47

Cat No.

: SA42414

Tenofovir alafenamide

Tenofovir Alafenamide Racemic D Isomer

$255.00 10 mg

In Stock

CAS No.

: NA

Mol F.

: C21H29N6O5P

Mol W.

: 476.47

Cat No.

: SA42408

Tenofovir alafenamide

Tenofovir Alafenamide Undesired Isomer (RRS Isomer)

$295.00 10 mg

In Stock

CAS No.

: 383365-04-6

Mol F.

: C21H29N6O5P

Mol W.

: 476.47

Cat No.

: SA42409

Tenofovir alafenamide

Tenofovir Anhydride Dimer

$255.00 25 mg

In Stock

CAS No.

: 1607007-18-0

Mol F.

: C30H56N12O7P2

Mol W.

: 758.79

Cat No.

: SA42410

Tenofovir

Tenofovir Desmethyl Impurity; Adefovir

$195.00 1 g

In Stock

CAS No.

: 106941-25-7

Mol F.

: C8H12N5O4P

Mol W.

: 273.19

Cat No.

: SA36934