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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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Ezetimibe, Impurities

Ezetimibe Phenexy Glucuronide

$950.00 25 mg

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CAS No.

: 190448-57-8

Mol F.

: C30H29F2NO9

Mol W.

: 585.56

Cat No.

: SA14823

Ezetimibe, Impurities

Ezetimibe Triol Impurity

$1,550.00 25 mg

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CAS No.

: 2363086-22-8

Mol F.

: C33H30F2N2OS

Mol W.

: 572.61

Cat No.

: SA14830

Famotidine, Impurities

Famotidine

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CAS No.

: 76824-35-6

Mol F.

: C8H15N7O2S3

Mol W.

: 337.45

Cat No.

: SA40800

Famotidine, Impurities

Famotidine Chloromethyl Impurity

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CAS No.

: 81152-53-6

Mol F.

: C5H7ClN4S

Mol W.

: 190.65

Cat No.

: SA43610

Famotidine, Impurities

Famotidine Cyanoethyl Impurity

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CAS No.

: 76823-93-3

Mol F.

: C8H11N5S2

Mol W.

: 241.34

Cat No.

: SA43601

Famotidine, Impurities

Famotidine Cyanoethyl Impurity

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CAS No.

: 76823-93-3

Mol F.

: C8H11N5S2

Mol W.

: 241.34

Cat No.

: SA40812

Famotidine, Impurities

Famotidine EP Impurity A

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CAS No.

: 124646-10-2

Mol F.

: C8H14N6S2

Mol W.

: 258.37

Cat No.

: SA40801

Famotidine, Impurities

Famotidine EP Impurity A

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CAS No.

: 88061-72-7 (2HCl); 76833-47-1 (HCl); 124646-10-2 (base)

Mol F.

: C8H16Cl2N6S2

Mol W.

: 331.29

Cat No.

: SA43602

Famotidine, Impurities

Famotidine EP Impurity B

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CAS No.

: 89268-62-2

Mol F.

: C16H23N11O2S5

Mol W.

: 561.77

Cat No.

: SA40802

Famotidine, Impurities

Famotidine EP Impurity C

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CAS No.

: 76824-17-4 (HCl); 106433-44-7 (Base)

Mol F.

: C8H15ClN6O3S3 (HCl salt)

Mol W.

: 374.89

Cat No.

: SA43603

Famotidine, Impurities

Famotidine EP Impurity D

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CAS No.

: 76824-16-3

Mol F.

: C8H13N5OS2

Mol W.

: 259.35

Cat No.

: SA43604

Famotidine, Impurities

Famotidine EP Impurity E

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CAS No.

: 129083-44-9

Mol F.

: C10H14N8S4

Mol W.

: 374.53

Cat No.

: SA43609

Famotidine, Impurities

Famotidine EP Impurity F

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CAS No.

: 107880-74-0

Mol F.

: C8H12N4O2S2

Mol W.

: 260.33

Cat No.

: SA43605

Famotidine, Impurities

Famotidine EP Impurity G

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CAS No.

: 76823-97-7

Mol F.

: C9H13N7S2

Mol W.

: 283.38

Cat No.

: SA40807

Famotidine, Impurities

Famotidine EP Impurity H

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CAS No.

: 88046-01-9 (2HCl); 106649-96-1 (base)

Mol F.

: C6H12Cl2N6S2

Mol W.

: 303.24

Cat No.

: SA43611

Famotidine, Impurities

Famotidine EP Impurity I (HCl)

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CAS No.

: NA

Mol F.

: C8H15ClN6O4S3

Mol W.

: 390.89

Cat No.

: SA43606

Famotidine, Impurities

Famotidine EP Impurity J

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CAS No.

: 1798006-30-0 (HCl); 76824-14-1 (base)

Mol F.

: C9H15ClN4O2S2 (HCl)

Mol W.

: 310.82

Cat No.

: SA43607

Famotidine, Impurities

Famotidine Methoxy Impurity

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CAS No.

: 76823-94-4

Mol F.

: C9H15N5OS2

Mol W.

: 273.38

Cat No.

: SA40811

Famotidine, Impurities

Famotidine Sulfoxide

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CAS No.

: 90237-03-9

Mol F.

: C8H15N7O3S3

Mol W.

: 353.44

Cat No.

: SA43608

Febuxostat, Impurities

Febuxostat Amide Methyl Ester

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CAS No.

: 1643131-89-8

Mol F.

: C17H20N2O4S

Mol W.

: 348.42

Cat No.

: SA32007

Febuxostat, Impurities

Febuxostat Descyano Ethyl Ester

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CAS No.

: 144060-97-9

Mol F.

: C17H21NO3S

Mol W.

: 319.42

Cat No.

: SA32020

Febuxostat, Impurities

Febuxostat Descyano Impurity

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CAS No.

: 1206550-99-3

Mol F.

: C15H17NO3S

Mol W.

: 291.37

Cat No.

: SA32016

Febuxostat, Impurities

Febuxostat Dicarboxylic Acid Impurity

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CAS No.

: 1239233-87-4

Mol F.

: C16H17NO5S

Mol W.

: 335.37

Cat No.

: SA32011

Febuxostat, Impurities

Febuxostat Dithiazole Acid Impurity

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CAS No.

: 1330632-48-8

Mol F.

: C20H20N2O5S2

Mol W.

: 432.51

Cat No.

: SA32015

Fenofibrate, Impurities

Fenirofibrate

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CAS No.

: 54419-31-7

Mol F.

: C17H17ClO4

Mol W.

: 320.77

Cat No.

: SA27212

Fenofibrate, Impurities

Fenofibrate EP Impurity C

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CAS No.

: 217636-47-0

Mol F.

: C17H15ClO3

Mol W.

: 302.75

Cat No.

: SA27203

Fenofibrate, Impurities

Fenofibrate EP Impurity F

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CAS No.

: 154356-96-4

Mol F.

: C16H15ClO2

Mol W.

: 274.74

Cat No.

: SA27206

Fenofibrate, Impurities

Fenofibric Acid 1-Carboxyl-1-methylethyl Ester

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CAS No.

: 1797121-54-0

Mol F.

: C21H21ClO6

Mol W.

: 404.84

Cat No.

: SA27209

Finasteride, Impurities

Finasteride

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CAS No.

: 98319-26-7

Mol F.

: C23H36N2O2

Mol W.

: 372.54

Cat No.

: SA36700

Finasteride, Impurities

Finasteride Carboxylic Acid

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CAS No.

: 104239-97-6

Mol F.

: C19H27NO3

Mol W.

: 317.42

Cat No.

: SA36705

Finasteride, Impurities

Finasteride Dehydro Carboxylic Acid

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CAS No.

: 1180488-92-9

Mol F.

: C19H25NO3

Mol W.

: 315.41000000000003

Cat No.

: SA36704

Finasteride, Impurities

Finasteride Dehydro Carboxylic Acid Methyl Ester

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CAS No.

: 166896-62-4

Mol F.

: C20H27NO3

Mol W.

: 329.43

Cat No.

: SA36706

Finasteride, Impurities

Finasteride Dihydro Carboxylic Acid

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CAS No.

: 103335-55-3

Mol F.

: C19H29NO3

Mol W.

: 319.44

Cat No.

: SA36707

Finasteride, Impurities

Finasteride Dihydro Carboxylic Acid Methyl Ester

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CAS No.

: 73671-92-8

Mol F.

: C20H31NO3

Mol W.

: 333.46

Cat No.

: SA36708

Finasteride, Impurities

Finasteride EP Impurity A

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CAS No.

: 98319-24-5

Mol F.

: C23H38N2O2

Mol W.

: 374.56

Cat No.

: SA36701

Finasteride, Impurities

Finasteride EP Impurity B

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CAS No.

: 103335-41-7

Mol F.

: C20H29NO3

Mol W.

: 331.45

Cat No.

: SA36702

Finasteride, Impurities

Finasteride EP Impurity C

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CAS No.

: 1329611-51-9

Mol F.

: C23H34N2O2

Mol W.

: 370.53

Cat No.

: SA36703

Fingolimod, Impurities

Fingolimod

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CAS No.

: 162359-55-9;162359-56-0(HCl)

Mol F.

: C19H34ClNO2

Mol W.

: 343.93

Cat No.

: SA34500

Fingolimod, Impurities

Fingolimod Decyl Analog

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CAS No.

: 780729-32-0

Mol F.

: C21H37NO2

Mol W.

: 335.52

Cat No.

: SA34506

Fingolimod, Impurities

Fingolimod Dimer Acid Impurity

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CAS No.

: 2147726-86-9

Mol F.

: C37H59NO4

Mol W.

: 581.87

Cat No.

: SA34512

Fingolimod, Impurities

Fingolimod Heptyl Analog

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CAS No.

: 745767-97-9;162361-44-6

Mol F.

: C18H32ClNO2

Mol W.

: 293.44

Cat No.

: SA34508

Fingolimod, Impurities

Fingolimod Hexyl Analog

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CAS No.

: 1201794-93-5

Mol F.

: C17H29NO2

Mol W.

: 279.42

Cat No.

: SA34507

Fingolimod, Impurities

Fingolimod Nitro Analog

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CAS No.

: 374077-88-0

Mol F.

: C19H31NO4

Mol W.

: 337.45

Cat No.

: SA34517

Fingolimod, Impurities

Fingolimod Nonyl Analog

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CAS No.

: 296282-40-1

Mol F.

: C20H36ClNO2

Mol W.

: 357.96

Cat No.

: SA34509

Cinnarizine, Impurities

Flunarizine Dihydrochloride

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CAS No.

: 30484-77-6

Mol F.

: C₂₆H₂₈Cl₂F₂N₂

Mol W.

: 477.42

Cat No.

: SA12408

Flunisolide, Impurities

Flunisolide

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CAS No.

: 3385-03-3

Mol F.

: C24H31FO6

Mol W.

: 434.5

Cat No.

: SA47500

Flunisolide, Impurities

Flunisolide 21-Dehydro Impurity

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CAS No.

: 1188271-69-3

Mol F.

: C24H29FO6

Mol W.

: 432.48

Cat No.

: SA47505

Flunisolide, Impurities

Flunisolide Acetate

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CAS No.

: 4533-89-5

Mol F.

: C26H33FO7

Mol W.

: 476.53

Cat No.

: SA47508

Flunisolide, Impurities

Flunisolide Related Compound C

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CAS No.

: 1432475-16-5

Mol F.

: C24H29FO7

Mol W.

: 448.48

Cat No.

: SA47503

Fluocinonide, Impurities

Fluocinolone Acetonide 9,11-Epoxide; Fluocinolone Acetonide EP Impurity E

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CAS No.

: 68352-03-4

Mol F.

: C24H29FO6

Mol W.

: 432.48

Cat No.

: SA35405