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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, Leflunomide

Ethyl-5-methyl isoxazole carboxylic acid | CAS NO : 51135-73-0

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CAS No.

: 51135-73-0

Mol F.

: C7H9NO3

Mol W.

: 155.15

Cat No.

: SA21821

Impurities, Nitrosamine

Ethyl(Z)-2-chloro-2-(2-(4-methoxyphenyl)-2-nitrosohydrazineylidene) acetate

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CAS No.

Mol F.

: C11H12ClN3O4

Mol W.

: 285.68

Cat No.

: SA44697

Apixaban, Impurities

Ethyl(Z)-2-chloro-2-(2-(4-methoxyphenyl)-2-nitrosohydrazineylidene) acetate

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CAS No.

Mol F.

: C11H12ClN3O4

Mol W.

: 285.68

Cat No.

: SA39949

Etravirine, Impurities

Etravirine

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CAS No.

: 269055-15-4(Base);1030633-38-5(HBrSalt)

Mol F.

: C20H15BrN6O

Mol W.

: 435.28

Cat No.

: SA26100

Etravirine, Impurities

Etravirine 6-Dimer Impurity

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CAS No.

: 1704730-70-0

Mol F.

: C29H21BrN6O2

Mol W.

: 565.41999999999996

Cat No.

: SA26112

Etravirine, Impurities

Etravirine butanamide Impurity

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CAS No.

: 2240161-92-4

Mol F.

: C25H24BrN7O2

Mol W.

: 534.4

Cat No.

: SA26113

Etravirine, Impurities

Etravirine Chloro Impurity

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CAS No.

: 269055-19-8

Mol F.

: C20H15ClN6O

Mol W.

: 390.83

Cat No.

: SA26110

Etravirine, Impurities

Etravirine N-Oxide Impurity

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CAS No.

: 907180-19-2

Mol F.

: C20H15BrN6O2

Mol W.

: 451.28

Cat No.

: SA26108

Exemestane, Impurities

Exemestane

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CAS No.

: 107868-30-4

Mol F.

: C20H24O2

Mol W.

: 296.39999999999998

Cat No.

: SA19100

Exemestane, Impurities

Exemestane ±β-Spirooxirane

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CAS No.

: NA

Mol F.

: C20H26O3

Mol W.

: 314.42

Cat No.

: SA19129

Exemestane, Impurities

Exemestane 3-ethoxy Impurity

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CAS No.

: NA

Mol F.

: C22H32O2

Mol W.

: 328.5

Cat No.

: SA19103

Exemestane, Impurities

Exemestane 6-Hydroxymethyl Impurity

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CAS No.

: 152764-26-6

Mol F.

: C₂₀H₂₄O₃

Mol W.

: 312.39999999999998

Cat No.

: SA19122

Exemestane, Impurities

Exemestane Diol Impurity

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CAS No.

: 184972-11-0

Mol F.

: C₂₀H₂₆O₄

Mol W.

: 330.42

Cat No.

: SA19121

Exemestane, Impurities

Exemestane EP Impurity B

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CAS No.

: 184972-09-6

Mol F.

: C20H26O3

Mol W.

: 314.42

Cat No.

: SA19127

Exemestane, Impurities

Exemestane EP Impurity C

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CAS No.

: 2130745-60-5

Mol F.

: C21H24O2

Mol W.

: 308.42

Cat No.

: SA19105

Exemestane, Impurities

Exemestane Impurity 24 Mixture

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CAS No.

Mol F.

: C20H24O3

Mol W.

: 312.4

Cat No.

: SA19139

Exemestane, Impurities

Exemestane Related Compound D

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CAS No.

: 2467590-81-2

Mol F.

: C20H24O2

Mol W.

: 296.41

Cat No.

: SA19104

Ezetimibe, Impurities

Ezetimibe 2-Fluoro Impurity

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CAS No.

: 2191318-99-5

Mol F.

: C24H21F2NO3

Mol W.

: 409.44

Cat No.

: SA14829

Ezetimibe, Impurities

Ezetimibe 2-hydroxyphenyl Isomer

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CAS No.

Mol F.

: C24H21F2NO3

Mol W.

: 409.15

Cat No.

: SA14859

Ezetimibe, Impurities

Ezetimibe 3-hydroxyphenyl Isomer

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CAS No.

Mol F.

: C24H21F2NO3

Mol W.

: 409.43

Cat No.

: SA14860

Ezetimibe, Impurities

Ezetimibe Diacid Impurity

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CAS No.

: 1013025-04-1

Mol F.

: C25H24FNO5

Mol W.

: 437.46

Cat No.

: SA14804

Ezetimibe, Impurities

Ezetimibe Diastereomers (R,R,R and S,S,S)

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CAS No.

Mol F.

: C24H21F2NO3

Mol W.

: 409.43

Cat No.

: SA14852

Ezetimibe, Impurities

Ezetimibe Hydroxy Glucuronide

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CAS No.

: 536709-33-8

Mol F.

: C30H29F2NO9

Mol W.

: 585.56

Cat No.

: SA14824

Ezetimibe, Impurities

Ezetimibe Lactam Cleaved Alcohol; 3’-Anhydro Ezetimibe Alcohol Impurity

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CAS No.

: 1374250-07-3

Mol F.

: C24H23F2NO2

Mol W.

: 395.45

Cat No.

: SA14817

Ezetimibe, Impurities

Ezetimibe meta-Fluorobenzene Isomer

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CAS No.

Mol F.

: C24H21F2NO3

Mol W.

: 409.43

Cat No.

: SA14858

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

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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