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Impurities

SynThink is a producer and supplier of a number of pharmaceutical Reference Standards (Impurity Standards) which are required for pharmaceutical companies to study quality, stability and biological safety of pharmaceutical products. Many API Impurities are available in our stock.

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Impurities, Primidone

Primidone Impurity E

Please enquire for price & pack size

In Stock

CAS No.

: 90-27-7

Mol F.

: C10H12O2

Mol W.

: 164.204

Cat No.

: SA20605

Impurities, Primidone

Primidone Impurity F

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In Stock

CAS No.

: 1189504-46-8

Mol F.

: C21H24N2O2

Mol W.

: 336.43

Cat No.

: SA20606

Chlorpromazine, Impurities

Prochlorperazine

$155.00 25 mg

In Stock

CAS No.

: 58-38-8

Mol F.

: C20H24ClN3S

Mol W.

: 373.94

Cat No.

: SA21616

Impurities, Progesterone

Progesterone EP Impurity B

Please enquire for price & pack size

In Stock

CAS No.

: 145-14-2

Mol F.

: C21H32O2

Mol W.

: 316.48

Cat No.

: SA18001

Impurities, Progesterone

Progesterone EP Impurity C

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In Stock

CAS No.

: 145-15-3

Mol F.

: C21H32O2

Mol W.

: 316.48

Cat No.

: SA18002

Impurities, Progesterone

Progesterone EP Impurity D

Please enquire for price & pack size

In Stock

CAS No.

: 5035-09-6

Mol F.

: C23H34O3

Mol W.

: 358.51

Cat No.

: SA18003

Impurities, Progesterone

Progesterone EP Impurity E

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In Stock

CAS No.

: 5062-62-4

Mol F.

: C23H34O3

Mol W.

: 358.51

Cat No.

: SA18004

Impurities, Progesterone

Progesterone EP Impurity H

Please enquire for price & pack size

In Stock

CAS No.

: 1162-56-7

Mol F.

: C21H28O2

Mol W.

: 312.44

Cat No.

: SA18006

Impurities, Progesterone

Progesterone EP Impurity J

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In Stock

CAS No.

: 1162-54-5

Mol F.

: C21H28O2

Mol W.

: 312.44

Cat No.

: SA18008

Impurities, Progesterone

Progesterone EP Impurity K

Please enquire for price & pack size

In Stock

CAS No.

: 17652-16-3

Mol F.

: C21H28O2

Mol W.

: 312.44

Cat No.

: SA18009

Impurities, Progesterone

Progesterone EP Impurity M

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In Stock

CAS No.

: 2000-66-0

Mol F.

: C21H30O2

Mol W.

: 314.46

Cat No.

: SA18011

Impurities, Propranolol

Propranolol Beta Naphthol Epoxide Impurity

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C13H12O2

Mol W.

: 200.23

Cat No.

: SA24616

Impurities, Propranolol

Propranolol Chloro impurity

Please enquire for price & pack size

In Stock

CAS No.

: 112805-69-3

Mol F.

: C13H13ClO2

Mol W.

: 236.69

Cat No.

: SA24601

Impurities, Propranolol

Propranolol EP Impurity A

Please enquire for price & pack size

In Stock

CAS No.

: 36112-95-5

Mol F.

: C13H14O3

Mol W.

: 218.25

Cat No.

: SA24603

Impurities, Propranolol

Propranolol EP Impurity B

Please enquire for price & pack size

In Stock

CAS No.

: 83314-78-7

Mol F.

: C29H33NO4

Mol W.

: 459.57

Cat No.

: SA24602

Impurities, Propranolol

Propranolol EP Impurity C

Please enquire for price & pack size

In Stock

CAS No.

: 17216-10-3

Mol F.

: C23H20O3

Mol W.

: 344.4

Cat No.

: SA24600

Impurities, Propranolol

Propranolol Epoxide impurity

Please enquire for price & pack size

In Stock

CAS No.

: 2461-42-9

Mol F.

: C13H12O2

Mol W.

: 200.23

Cat No.

: SA24609

Impurities, Propranolol

Propranolol ethyl Amine Impurity

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C15H19NO2

Mol W.

: 245.32

Cat No.

: SA24612

Impurities, Naltrexone

Pseudonaltrexone; Naltrexone dimer

Please enquire for price & pack size

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

Please enquire for price & pack size

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

Please enquire for price & pack size

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

Please enquire for price & pack size

In Stock

CAS No.

: 177530-93-7

Mol F.

: C14H9ClF3NO2

Mol W.

: 315.67

Cat No.

: SA17601

Impurities, Praziquantel

rac-hydroxy praziquantle Impurity

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C19H24N2O3

Mol W.

: 328.4

Cat No.

: SA13909

Ibrutinib, Impurities

rac-N-Desacryloyl N-Propionyl Ibrutinib

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C25H26N6O2

Mol W.

: 422.51

Cat No.

: SA47410

Impurities, Raloxifene

Raloxifene 4′-Ethoxy Analog

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C30H31NO4S

Mol W.

: 501.64

Cat No.

: SA24918

Impurities, Raloxifene

Raloxifene 6-Ethoxy Analog

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C30H31NO4S

Mol W.

: 501.64

Cat No.

: SA24919

Impurities, Raloxifene

Raloxifene Bismethyl Ether

Please enquire for price & pack size

In Stock

CAS No.

: 84541-38-8

Mol F.

: C30H31NO4S

Mol W.

: 501.64

Cat No.

: SA24902

Impurities, Raloxifene

Raloxifene Des(piperidineethyl) Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 177744-96-6

Mol F.

: C21H14O4S

Mol W.

: 362.4

Cat No.

: SA24921

Impurities, Raloxifene

Raloxifene Diethoxy Impurity

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C32H35NO4S

Mol W.

: 529.69

Cat No.

: SA24922

Impurities, Raloxifene

Raloxifene Dimesylate Hydrochloride

Please enquire for price & pack size

In Stock

CAS No.

: 84449-85-4

Mol F.

: C30H31NO8S3.HCl

Mol W.

: 666.22

Cat No.

: SA24906

Impurities, Raloxifene

Raloxifene Hydrochloride

Please enquire for price & pack size

In Stock

CAS No.

: 82640-04-8

Mol F.

: C28H28ClNO4S

Mol W.

: 510.04

Cat No.

: SA24901

Impurities, Ranitidine

Ranitidine EP Impurity A

Please enquire for price & pack size

In Stock

CAS No.

: 72126-78-4

Mol F.

: C22H35N5O4S2

Mol W.

: 497.67

Cat No.

: SA26501

Impurities, Ranitidine

Ranitidine EP Impurity B

Please enquire for price & pack size

In Stock

CAS No.

: 66356-53-4

Mol F.

: C10H18N2OS

Mol W.

: 214.33

Cat No.

: SA26502

Impurities, Ranitidine

Ranitidine EP Impurity C

Please enquire for price & pack size

In Stock

CAS No.

: 73851-70-4

Mol F.

: C13H22N4O4S

Mol W.

: 330.4

Cat No.

: SA26503

Impurities, Ranitidine

Ranitidine EP Impurity D

Please enquire for price & pack size

In Stock

CAS No.

: 117846-02-3

Mol F.

: C12H19N3O4S

Mol W.

: 301.36

Cat No.

: SA26504

Impurities, Ranitidine

Ranitidine EP Impurity E

Please enquire for price & pack size

In Stock

CAS No.

: 73857-20-2

Mol F.

: C13H22N4O4S

Mol W.

: 330.4

Cat No.

: SA26505

Impurities, Ranitidine

Ranitidine EP Impurity F

Please enquire for price & pack size

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

Please enquire for price & pack size

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

Please enquire for price & pack size

In Stock

CAS No.

: 72078-82-1

Mol F.

: C3H6N2O3

Mol W.

: 118.09

Cat No.

: SA26508

Impurities, Ranitidine

Ranitidine EP Impurity I

Please enquire for price & pack size

In Stock

CAS No.

: 207592-21-0

Mol F.

: C27H44N8O6S2

Mol W.

: 640.82

Cat No.

: SA26509

Impurities, Ranitidine

Ranitidine EP Impurity K

Please enquire for price & pack size

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