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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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Clotrimazole, Impurities

4-Chlorotrityl chloride

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Out of Stock

CAS No.

: 27023-37-6

Mol F.

: C19H14Cl2

Mol W.

: 313.22

Cat No.

: SA11607

Impurities, Raltegravir

4-Defluoro 4-Methoxy Raltegravir

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Out of Stock

CAS No.

Mol F.

: C21H24N6O6

Mol W.

: 456.45

Cat No.

: SA25608

Impurities, Trimethoprim

4-Demethyltrimethoprim

$95.00 25 mg

Out of Stock

CAS No.

: 21253-58-7

Mol F.

: C13H16N4O3

Mol W.

: 276.29

Cat No.

: SA27112

Efinaconazole, Impurities

4-desfluoro 4 (1,2,4-triazol) (R,S)-Efinaconazole Epoxide

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Out of Stock

CAS No.

: NA

Mol F.

: C14H13FN6O

Mol W.

: 300.29000000000002

Cat No.

: SA23600

Efinaconazole, Impurities

4-Desmethylene-4-hydroxymethyl-efinaconazole

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Out of Stock

CAS No.

: NA

Mol F.

: C18H24F2N4O2

Mol W.

: 366.41

Cat No.

: SA23606

Brimonidine, Impurities

4-Dimethylaminopyridine; Brimonidine Dimethyl Amino Pyridine

Please enquire for price & pack size

Out of Stock

CAS No.

: 1122-58-3

Mol F.

: C7H10N2

Mol W.

: 122.17

Cat No.

: SA20727

Impurities, Osimertinib

4-Fluoro-2-methoxy-5-nitroaniline

Please enquire for price & pack size

Out of Stock

CAS No.

: 1075705-01-9

Mol F.

: C7H7FN2O3

Mol W.

: 186.14

Cat No.

: SA44701

Impurities, Paroxetine

4-Fluoro-4’-formylbiphenyl

$100.00 25 mg

Out of Stock

CAS No.

: 60992-98-5

Mol F.

: C₁₃H₉FO

Mol W.

: 200.21

Cat No.

: SA18315

Cariprazine, Impurities

4-Hydroxy 2,3-Dichlorophenyl Cariprazine

Please enquire for price & pack size

Out of Stock

CAS No.

: 1084891-95-1

Mol F.

: C‚Hƒ‚Cl‚N„O‚

Mol W.

: 443.41

Cat No.

: SA39708

Impurities, Raloxifene

4-Hydroxy benzothiophene Raloxifene

Please enquire for price & pack size

Out of Stock

CAS No.

: 185416-01-7

Mol F.

: C28H27NO4S

Mol W.

: 473.58

Cat No.

: SA24912

Darunavir, Impurities

4-Hydroxy Darunavir

Please enquire for price & pack size

Out of Stock

CAS No.

: 313682-97-2

Mol F.

: C27H37N3O8S

Mol W.

: 563.66

Cat No.

: SA39407

Donepezil, Impurities

4-Hydroxy Donepezil Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 197010-22-3

Mol F.

: C24H29NO4

Mol W.

: 395.49

Cat No.

: SA34317

Erlotinib, Impurities

4-Hydroxy Erlotinib

Please enquire for price & pack size

Out of Stock

CAS No.

: 882420-22-6

Mol F.

: C22H23N3O5

Mol W.

: 409.44

Cat No.

: SA25201

Ethinylestradiol, Impurities

4-Hydroxy Ethinylestradiol

Please enquire for price & pack size

Out of Stock

CAS No.

: 50394-90-6

Mol F.

: C20H24O3

Mol W.

: 312.4

Cat No.

: SA13126

Fingolimod, Impurities

4-Hydroxy Fingolimod Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 268557-51-3(HCl);162361-49-1(Base)

Mol F.

: C19H34ClNO3

Mol W.

: 359.93

Cat No.

: SA34504

Ibrutinib, Impurities

4-Hydroxy Ibrutinib

Please enquire for price & pack size

Out of Stock

CAS No.

: 1288339-18-3

Mol F.

: C25H24N6O3

Mol W.

: 456.5

Cat No.

: SA47412

Impurities, Trimetazidine

4-Hydroxy Trimetazidine Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C13H20N2O3

Mol W.

: 252.31

Cat No.

: SA35111

Impurities, Trimethoprim

4-Hydroxy Trimethoprim

$495.00 25 mg

Out of Stock

CAS No.

: 112678-48-5

Mol F.

: C14H18N4O4

Mol W.

: 306.32

Cat No.

: SA27114

Impurities, Valsartan

4-Hydroxy Valsartan

Please enquire for price & pack size

Out of Stock

CAS No.

: 188259-69-0

Mol F.

: C24H29N5O4

Mol W.

: 451.52

Cat No.

: SA33305

Allopurinol, Impurities

4-Hydroxy-1-phenylpyrazolo[3,4-d]pyrimidine

Please enquire for price & pack size

Out of Stock

CAS No.

: 21314-17-0

Mol F.

: C11H8N4O

Mol W.

: 212.21

Cat No.

: SA28915

Impurities, Trimetazidine

4-hydroxy-2,3-dimethoxybenzaldehyde

Please enquire for price & pack size

Out of Stock

CAS No.

: 69471-05-2

Mol F.

: C9H10O4

Mol W.

: 182.17

Cat No.

: SA35110

Impurities, Leflunomide

4-Hydroxy-Teriflunomide

Please enquire for price & pack size

Out of Stock

CAS No.

: 1058722-45-4

Mol F.

: C12H9F3N2O3

Mol W.

: 286.20999999999998

Cat No.

: SA21813

Clomifene, Impurities

4-Hydroxy-α,β-diphenylbenzeneethanol

Please enquire for price & pack size

Out of Stock

CAS No.

: 94549-25-4

Mol F.

: C20H18O2

Mol W.

: 290.35

Cat No.

: SA21711

Efinaconazole, Impurities

4-Hydroxymethyl-1-benzoyl Piperidine

Please enquire for price & pack size

Out of Stock

CAS No.

: 19980-00-8

Mol F.

: C13H17NO2

Mol W.

: 219.58

Cat No.

: SA23613

Impurities, Rilpivirine

4-Iodo-2,6-bis(methoxymethyl)aniline

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C10H14INO2

Mol W.

: 307.13

Cat No.

: SA25405

Impurities, Omeprazole

4-Methoxy-2-nitroaniline

Please enquire for price & pack size

Out of Stock

CAS No.

: 96-96-8

Mol F.

: C7H8N2O3

Mol W.

: 168.15

Cat No.

: SA19401

Impurities, Ranolazine

4-Methoxyphenol

Please enquire for price & pack size

Out of Stock

CAS No.

: 150-76-5

Mol F.

: C7H8O2

Mol W.

: 124.14

Cat No.

: SA26810

Apixaban, Impurities

4-Methoxyphenylhydrazine Hydrochloride

Please enquire for price & pack size

Out of Stock

CAS No.

: 19501-58-7

Mol F.

: C7H10N2O·HCl

Mol W.

: 174.63

Cat No.

: SA39927

Apixaban, Impurities

4-Methyl-5-chlorovaleroyl Chloride

Please enquire for price & pack size

Out of Stock

CAS No.

: 813452-05-0

Mol F.

: C6H10Cl2O

Mol W.

: 169.05

Cat No.

: SA39956

Impurities, Pazopanib

4-Methyloxidoamino Pazopanib

Please enquire for price & pack size

Out of Stock

CAS No.

: 1821666-73-2

Mol F.

: C21H23N7O3S

Mol W.

: 453.5

Cat No.

: SA51316

Impurities, Lenalidomide

4-Nitro Lenalidomide Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 827026-45-9

Mol F.

: C13H11N3O5

Mol W.

: 289.24

Cat No.

: SA34105

Impurities, Sulfamethoxazole

4-Nitro Sulfamethoxazole

Please enquire for price & pack size

Out of Stock

CAS No.

: 29699-89-6

Mol F.

: C10H9N3O5S

Mol W.

: 283.26

Cat No.

: SA25508

Impurities, Sulfamethoxazole

4-Nitroso Sulfamethoxazole

Please enquire for price & pack size

Out of Stock

CAS No.

: 131549-85-4

Mol F.

: C10H9N3O4S

Mol W.

: 267.26

Cat No.

: SA25507

Ezetimibe, Impurities

4-O-Methylphenyl Ezetimibe Ketone

Please enquire for price & pack size

Out of Stock

CAS No.

: 190595-65-4

Mol F.

: C31H25F2NO3

Mol W.

: 497.53

Cat No.

: SA14848

Dolutegravir, Impurities

4-Oxo-3-[(phenylmethyl)oxy]-4H-pyran-2-carboxylic Acid

Please enquire for price & pack size

Out of Stock

CAS No.

: 119736-16-2

Mol F.

: C13H10O5

Mol W.

: 246.22

Cat No.

: SA20225

Dolutegravir, Impurities

4-Oxo-4H-pyran-2,5-dicarboxylic Acid 2,5-Diethyl Ester

Please enquire for price & pack size

Out of Stock

CAS No.

: 1246616-74-9

Mol F.

: C11H12O6

Mol W.

: 240.21

Cat No.

: SA20226

Apixaban, Impurities

4-Pentenoyl chloride

Please enquire for price & pack size

Out of Stock

CAS No.

: 39716-58-0

Mol F.

: C5H7ClO

Mol W.

: 118.56

Cat No.

: SA39957

Bosentan, Impurities

4-tert-Butylbenzenesulfonamide

Please enquire for price & pack size

Out of Stock

CAS No.

: 6292-59-7

Mol F.

: C10H15NO2S

Mol W.

: 213.3

Cat No.

: SA28604

Gemcitabine, Impurities

4,4-Difluoro-2-(hydroxymethyl)-5-oxotetrahydrofuran-3-yl benzoate

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C12H10F2O5

Mol W.

: 272.2

Cat No.

: SA44510

Epinephrine, Impurities

4,4′-(Piperazine-2,5-diyl)dibenzene-1,2-diol

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C16H18N2O4

Mol W.

: 302.33

Cat No.

: SA46500

Impurities, Sulfamethoxazole

4,4’-Azoxybis[N-(5-methyl-3-isoxazolyl)-benzenesulfonamide

Please enquire for price & pack size

Out of Stock

CAS No.

: 119403-03-1

Mol F.

: C20H18N6O7S2

Mol W.

: 518.52

Cat No.

: SA25509

Dapsone, Impurities

4,4’-Dichlorodiphenyl Sulfone

Please enquire for price & pack size

Out of Stock

CAS No.

: 80-07-9

Mol F.

: C12H8Cl2O2S2

Mol W.

: 287.16

Cat No.

: SA27012

Impurities, Prednisone

4,5-Dihydro Prednisone

Please enquire for price & pack size

Out of Stock

CAS No.

: 103881-93-2

Mol F.

: C21H28O5

Mol W.

: 360.44

Cat No.

: SA26210

Impurities, Topiramate

4,5-O-(1-Methylethylidene)-β-D-fructopyranose

Please enquire for price & pack size

Out of Stock

CAS No.

: 912456-61-2

Mol F.

: C9H16O6

Mol W.

: 220.22

Cat No.

: SA45513

Edoxaban, Impurities

4,5,6,7-Tetrahydrothiazolo[4,5-c]pyridin-2-amine

Please enquire for price & pack size

Out of Stock

CAS No.

: 1781640-92-3

Mol F.

: C6H9N3S

Mol W.

: 155.22

Cat No.

: SA33050

Impurities, Vericiguat

4,6-Diamino-2-(5-fluoro-1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl)-5-((methoxycarbonyl)amino)pyrimidine 1-oxide

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C19H16F2N8O3

Mol W.

: 442.4

Cat No.

: SA50705

Allopurinol, Impurities

4,6-Dihydroxypyrazolo[3,4-d]pyrimidine

Please enquire for price & pack size

Out of Stock

CAS No.

: 2465-59-0

Mol F.

: C5H4N4O2

Mol W.

: 152.11

Cat No.

: SA28912

Allopurinol, Impurities

4,6-Dimethoxy-1H-pyrazolo[3,4-d]pyrimidine

Please enquire for price & pack size

Out of Stock

CAS No.

: 98277-30-6

Mol F.

: C7H8N4O2

Mol W.

: 180.16

Cat No.

: SA28914

Hydroxychloroquine, Impurities

4,7-Dichloroquine

Please enquire for price & pack size

Out of Stock

CAS No.

: 58175-86-3

Mol F.

: C18H26ClN3

Mol W.

: 319.87

Cat No.

: SA23803

Impurities, Pregabalin

4,9-Diisobutyl-1,6-diazecane-2,7-dione

$395.00 25 mg

Out of Stock

CAS No.

: 1990538-03-8

Mol F.

: C16H30N2O2

Mol W.

: 282.42

Cat No.

: SA24832