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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, Naltrexone

Pseudonaltrexone; Naltrexone dimer

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In Stock

CAS No.

: 607732-61-6

Mol F.

: C40H44N2O8

Mol W.

: 680.79

Cat No.

: SA47801

Impurities, Tiotropium

Pseudoscopine

$350.00 25 mg

In Stock

CAS No.

: 498-45-3

Mol F.

: C8H13NO2

Mol W.

: 155.19

Cat No.

: SA11716

Emtricitabine, Impurities

Pyrimidinedione analog; Emtricitabine 5-fluorouracil

$295.00 25 mg

In Stock

CAS No.

: 145986-11-4

Mol F.

: C₈H₉FN₂O₄S

Mol W.

: 248.23

Cat No.

: SA22907

Brimonidine, Impurities

Quinoxaline 6-Isothiocyanate

$350.00 25 mg

In Stock

CAS No.

: 135306-56-8

Mol F.

: C9H5N3S

Mol W.

: 187.22

Cat No.

: SA20724

Empagliflozin, Impurities

R-Isomer Side chain of Empagliflozin

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In Stock

CAS No.

: 2194590-02-6

Mol F.

: C17H16ClIO2

Mol W.

: 414.67

Cat No.

: SA15144

Bupropion, Impurities

rac erythro-Dihydro Bupropion

$125.00 25 mg

In Stock

CAS No.

: 99102-04-2

Mol F.

: C13H20ClNO

Mol W.

: 241.76

Cat No.

: SA12202

Impurities, Venlafaxine

rac N-Desmethyl Venlafaxine

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In Stock

CAS No.

: 149289-30-5

Mol F.

: C16H25NO2

Mol W.

: 263.37

Cat No.

: SA22725

Bupropion, Impurities

rac threo-Dihydro Bupropion

$125.00 25 mg

In Stock

CAS No.

: 92264-82-9

Mol F.

: C13H20ClNO

Mol W.

: 241.76

Cat No.

: SA12201

Brivaracetam, Impurities

rac-Brivaracetam

$195.00 25 mg

In Stock

CAS No.

: 357335-87-6

Mol F.

: C11H20N2O2

Mol W.

: 212.3

Cat No.

: SA47301

Efavirenz, Impurities

Rac-Efavirenz

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In Stock

CAS No.

: 177530-93-7

Mol F.

: C14H9ClF3NO2

Mol W.

: 315.67

Cat No.

: SA17601

Impurities, Praziquantel

rac-hydroxy praziquantle Impurity

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In Stock

CAS No.

Mol F.

: C19H24N2O3

Mol W.

: 328.4

Cat No.

: SA13909

Ibrutinib, Impurities

rac-N-Desacryloyl N-Propionyl Ibrutinib

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In Stock

CAS No.

: NA

Mol F.

: C25H26N6O2

Mol W.

: 422.51

Cat No.

: SA47410

Impurities, Raloxifene

Raloxifene 4′-Ethoxy Analog

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In Stock

CAS No.

Mol F.

: C30H31NO4S

Mol W.

: 501.64

Cat No.

: SA24918

Impurities, Raloxifene

Raloxifene 6-Ethoxy Analog

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In Stock

CAS No.

Mol F.

: C30H31NO4S

Mol W.

: 501.64

Cat No.

: SA24919

Impurities, Raloxifene

Raloxifene Bismethyl Ether

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In Stock

CAS No.

: 84541-38-8

Mol F.

: C30H31NO4S

Mol W.

: 501.64

Cat No.

: SA24902

Impurities, Raloxifene

Raloxifene Des(piperidineethyl) Impurity

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CAS No.

: 177744-96-6

Mol F.

: C21H14O4S

Mol W.

: 362.4

Cat No.

: SA24921

Impurities, Raloxifene

Raloxifene Diethoxy Impurity

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In Stock

CAS No.

Mol F.

: C32H35NO4S

Mol W.

: 529.69

Cat No.

: SA24922

Impurities, Raloxifene

Raloxifene Dimesylate Hydrochloride

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In Stock

CAS No.

: 84449-85-4

Mol F.

: C30H31NO8S3.HCl

Mol W.

: 666.22

Cat No.

: SA24906

Impurities, Raloxifene

Raloxifene Hydrochloride

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In Stock

CAS No.

: 82640-04-8

Mol F.

: C28H28ClNO4S

Mol W.

: 510.04

Cat No.

: SA24901

Impurities, Ranitidine

Ranitidine EP Impurity A

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In Stock

CAS No.

: 72126-78-4

Mol F.

: C22H35N5O4S2

Mol W.

: 497.67

Cat No.

: SA26501

Impurities, Ranitidine

Ranitidine EP Impurity B

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In Stock

CAS No.

: 66356-53-4

Mol F.

: C10H18N2OS

Mol W.

: 214.33

Cat No.

: SA26502

Impurities, Ranitidine

Ranitidine EP Impurity C

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In Stock

CAS No.

: 73851-70-4

Mol F.

: C13H22N4O4S

Mol W.

: 330.4

Cat No.

: SA26503

Impurities, Ranitidine

Ranitidine EP Impurity D

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In Stock

CAS No.

: 117846-02-3

Mol F.

: C12H19N3O4S

Mol W.

: 301.36

Cat No.

: SA26504

Impurities, Ranitidine

Ranitidine EP Impurity E

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In Stock

CAS No.

: 73857-20-2

Mol F.

: C13H22N4O4S

Mol W.

: 330.4

Cat No.

: SA26505

Impurities, Ranitidine

Ranitidine EP Impurity F

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In Stock

CAS No.

: 15433-79-1(base);81074-81-9(HClsalt)

Mol F.

: C8H13NO2

Mol W.

: 155.19

Cat No.

: SA26506

Impurities, Ranitidine

Ranitidine EP Impurity G

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In Stock

CAS No.

: 148639-72-9(base);112233-23-5(HClsalt)

Mol F.

: C5H9N3OS

Mol W.

: 159.19999999999999

Cat No.

: SA26507

Impurities, Ranitidine

Ranitidine EP Impurity H

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In Stock

CAS No.

: 72078-82-1

Mol F.

: C3H6N2O3

Mol W.

: 118.09

Cat No.

: SA26508

Impurities, Ranitidine

Ranitidine EP Impurity I

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In Stock

CAS No.

: 207592-21-0

Mol F.

: C27H44N8O6S2

Mol W.

: 640.82

Cat No.

: SA26509

Impurities, Ranitidine

Ranitidine EP Impurity K

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In Stock

CAS No.

: 61832-41-5

Mol F.

: C4H8N2O2S

Mol W.

: 148.18

Cat No.

: SA26511

Impurities, Ranitidine

Ranitidine Methyl Iodide

Please enquire for price & pack size

In Stock

CAS No.

: 13623-94-4

Mol F.

: C15H25IN3OS

Mol W.

: 456.07

Cat No.

: SA26517

Febuxostat, Impurities

RESOLUTION MIXTURE (FEBUXOSTAT – IMP STD )

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C32H32N4O6S2

Mol W.

: 632.75

Cat No.

: SA32023

Impurities, Rilpivirine

Rilpivirine

Please enquire for price & pack size

In Stock

CAS No.

: 500287-72-9

Mol F.

: C22H18N6

Mol W.

: 366.42

Cat No.

: SA25416

Impurities, Rilpivirine

Rilpivirine amide 1 impurity

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In Stock

CAS No.

: 500288-66-4

Mol F.

: C22H20N6O

Mol W.

: 384.43

Cat No.

: SA25406

Impurities, Rilpivirine

Rilpivirine Chloro Impurity

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In Stock

CAS No.

: 244768-32-9

Mol F.

: C11H7ClN4

Mol W.

: 230.65

Cat No.

: SA25410

Impurities, Rilpivirine

Rilpivirine Desmethyl Impurity

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In Stock

CAS No.

: 500292-48-8

Mol F.

: C21H16N6

Mol W.

: 352.4

Cat No.

: SA25420

Impurities, Nitrosamine, Rilpivirine

Rilpivirine Hydrochloride nitrosamine impurity

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C22H17N7O

Mol W.

: 395.4

Cat No.

: SA44607

Impurities, Rilpivirine

Rilpivirine Hydroxy Impurity

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In Stock

CAS No.

: 189956-45-4

Mol F.

: C11H8N4O

Mol W.

: 212.21

Cat No.

: SA25409

Impurities, Rilpivirine

Rilpivirine Nitrile Impurity

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C11H12N2

Mol W.

: 172.23

Cat No.

: SA25414

Ezetimibe, Impurities

Ring opened ezetimibe impurity

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In Stock

CAS No.

: 1197811-72-5

Mol F.

: C24H23F2NO3

Mol W.

: 411.44

Cat No.

: SA14847

Impurities, Rivaroxaban

RIV1-dimer-R Isomer

$100.00 25 mg

In Stock

CAS No.

: 1643354-27-1

Mol F.

: C32H30N4O8

Mol W.

: 598.61

Cat No.

: SA18624

Impurities, Rivaroxaban

RIV1-dimer-S Isomer

$100.00 25 mg

In Stock

CAS No.

Mol F.

: C32H30N4O8

Mol W.

: 598.6

Cat No.

: SA18627

Impurities, Rivaroxaban

Rivaroxaban 3-Chloro Isomer

$195.00 25 mg

In Stock

CAS No.

Mol F.

: C19H18ClN3O5S

Mol W.

: 435.88

Cat No.

: SA18608

Impurities, Rivaroxaban

Rivaroxaban Amine Impurity

$80.00 25 mg

In Stock

CAS No.

: 446292-10-0 (base); 898543-06-1 (HCl salt)

Mol F.

: C₁₄H₁₈ClN₃O₄

Mol W.

: 327.76

Cat No.

: SA18602

Impurities, Rivaroxaban

Rivaroxaban Degradation Product 1

$150.00 25 mg

In Stock

CAS No.

: 1816946-19-6

Mol F.

: C13H19N3O2

Mol W.

: 449.31

Cat No.

: SA18615

Impurities, Rivaroxaban

Rivaroxaban Descarbanyl Bisthiphene Impurity

$295.00 25 mg

In Stock

CAS No.

: 1838133-00-8

Mol F.

: C23H21Cl2N3O5S2

Mol W.

: 554.47

Cat No.

: SA18619

Impurities, Rivaroxaban

Rivaroxaban Descarbony Open-ring Impurity; Rivaroxaban-RVXRC-11

$395.00 25 mg

In Stock

CAS No.

Mol F.

: C18H23Cl2N3O5S

Mol W.

: 427.902●72.92

Cat No.

: SA18612

Impurities, Rivaroxaban

Rivaroxaban Descarbonyl Impurity

$195.00 25 mg

In Stock

CAS No.

: 721401-53-2; 482305-98-6

Mol F.

: C18H20ClN3O4S

Mol W.

: 409.89

Cat No.

: SA18611

Impurities, Rivaroxaban

Rivaroxaban Diol

Please enquire for price & pack size

In Stock

CAS No.

: 1160170-00-2

Mol F.

: C₁₉H₂₀ClN₃O₆S

Mol W.

: 453.9

Cat No.

: SA18607

Rivaroxaban

Rivaroxaban EP Impurity I

$250.00 25 mg

In Stock

CAS No.

: 1151893-81-0

Mol F.

: C24H21Cl2N3O7S2

Mol W.

: 598.48

Cat No.

: SA18620

Impurities, Rivaroxaban

Rivaroxaban Impurity B

$100.00 25 mg

In Stock

CAS No.

Mol F.

: C16H19N3O6

Mol W.

: 349.34

Cat No.

: SA18617