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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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Colesevelam

N-Nitroso Didecylamine

$175.00 25 mg

In Stock

CAS No.

: 69112-95-4

Mol F.

: C20H42N2O

Mol W.

: 326.56

Cat No.

: SA10217

Diltiazem, Impurities, Nitrosamine

N-Nitroso Diltiazem EP Impurity G

$195.00 25 mg

In Stock

CAS No.

Mol F.

: C21H23N3O5S

Mol W.

: 429.49

Cat No.

: SA19531

Duloxetine

N-Nitroso Duloxetine

$155.00 25 mg

In Stock

CAS No.

Mol F.

: C18H18N2O2S

Mol W.

: 326.41

Cat No.

: SA36317

Fosaprepitant

N-Nitroso Fosaprepitant Impurity

$125.00 25 mg

In Stock

CAS No.

Mol F.

: C20H17F7N2O3

Mol W.

: 466.35

Cat No.

: SA45428

Ibrutinib

N-Nitroso Ibrutinib Impurity 2

$195.00 50 mg

In Stock

CAS No.

Mol F.

: C22H21N7O2

Mol W.

: 415.45

Cat No.

: SA47422

Impurities, Isavuconazole

N-Nitroso Isavuconazonium

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C35H34F2N9O6S+

Mol W.

: 746.76

Cat No.

: SA44127

Vildagliptin

N-Nitroso L-Prolinaminde

$155.00 25 mg

In Stock

CAS No.

: 79108-51-3

Mol F.

: C5H9N3O2

Mol W.

: 143.1

Cat No.

: SA23919

Nortriptyline

N-Nitroso Nortriptyline

$195.00 25 mg

In Stock

CAS No.

: 55855-42-0

Mol F.

: C19H20N2O

Mol W.

: 292.37

Cat No.

: SA50401

Bupropion

N-Nitroso of 4-Fluoro Bupropion

$295.00 25 mg

In Stock

CAS No.

Mol F.

: C13H17FN2O2

Mol W.

: 252.28

Cat No.

: SA12245

Impurities, Nitrosamine, Palbociclib

N-Nitroso Palbociclib 1

$145.00 25 mg

In Stock

CAS No.

: 2955712-44-2

Mol F.

: C24H28N8O3

Mol W.

: 476.53

Cat No.

: SA40426

Impurities, Nitrosamine, Paroxetine

N-Nitroso paroxetine Impurity

$125.00 50 mg

In Stock

CAS No.

: 2361294-43-9

Mol F.

: C19H19FN2O4

Mol W.

: 358.4

Cat No.

: SA18317

Impurities, Nitrosamine, Rivaroxaban

N-Nitroso Rivaroxaban Impurity G

$99.00 10 mg

In Stock

CAS No.

Mol F.

: C18H19ClN4O5S

Mol W.

: 438.89

Cat No.

: SA18631

Impurities, Nitrosamine, Rivaroxaban

N-Nitroso Rivaroxaban Open-Ring Acid Impurity

$90.00 10 mg

In Stock

CAS No.

Mol F.

: C19H19ClN4O7S

Mol W.

: 482.89

Cat No.

: SA18630

Salmeterol

N-Nitroso Salmeterol

$125.00 25 mg

In Stock

CAS No.

: 3036581-81-1

Mol F.

: C25H36N2O5

Mol W.

: 444.56

Cat No.

: SA10111

Impurities, Nitrosamine, Sitagliptin

N-Nitroso Sitagliptin Impurity

$125.00 25 mg

In Stock

CAS No.

: 2892260-32-9

Mol F.

: C6H6F3N5O

Mol W.

: 221.1

Cat No.

: SA10452

Tadalafil

N-Nitroso Tadalafil

$155.00 25 mg

In Stock

CAS No.

Mol F.

: C22H18N4O5

Mol W.

: 418.4

Cat No.

: SA20915

Impurities, Nitrosamine, Tetracaine

N-Nitroso Tetracaine | CAS : 3038740-94-9

$99.00 10 mg

In Stock

CAS No.

: 3038740-94-9

Mol F.

: C15H23N3O3

Mol W.

: 293.37

Cat No.

: SA446109

Impurities, Nitrosamine, Timolol

N-Nitroso Timolol

$155.00 25 mg

In Stock

CAS No.

Mol F.

: C13H23N5O4S

Mol W.

: 345.42

Cat No.

: SA23223

Impurities, Nitrosamine, Trimetazidine

N-Nitroso Trimetazidine

$195.00 100 mg

In Stock

CAS No.

: 92432-50-3

Mol F.

: C14H21N3O4

Mol W.

: 295.33

Cat No.

: SA35114

Impurities, Nitrosamine, Venlafaxine

N-Nitroso Venlafaxine Impurity E

$295.00 50 mg

In Stock

CAS No.

Mol F.

: C16H22N2O3

Mol W.

: 290.36

Cat No.

: SA22739

Impurities, Nitrosamine, Venlafaxine

N-Nitroso Venlafaxine Impurity F

$295.00 50 mg

In Stock

CAS No.

Mol F.

: C16H22N2O2

Mol W.

: 274.36

Cat No.

: SA22738

Impurities, Nitrosamine, Venlafaxine

N-Nitroso Venlafaxine Impurity H

$355.00 50 mg

In Stock

CAS No.

Mol F.

: C24H32N2O4

Mol W.

: 412.52

Cat No.

: SA22740

Vildagliptin

N-Nitroso Vildagliptin Amide Analog

$145.00 50 mg

In Stock

CAS No.

: NA

Mol F.

: C17H26N4O4

Mol W.

: 350.41

Cat No.

: SA23920

Impurities, Nitrosamine, Vortioxetine

N-Nitroso Vortioxetine Sulfoxide

$395.00 50 mg

In Stock

CAS No.

Mol F.

: C18H21N3O2S

Mol W.

: 343.44

Cat No.

: SA50302

Atomoxetine, Impurities, Nitrosamine

N-Nitroso-Atomoxetine

$155.00 25 mg

In Stock

CAS No.

: 3028194-77-3

Mol F.

: C17H20N2O2

Mol W.

: 284.4

Cat No.

: SA22123

Impurities, Nitrosamine, Zolmitriptan

N-Nitroso-N-Desmethyl Zolmitriptan

$195.00 25 mg

In Stock

CAS No.

: NA

Mol F.

: C15H18N4O3

Mol W.

: 302.33

Cat No.

: SA11908

Impurities, Nintedanib, Nitrosamine

N-Nitroso-N-Desmethylnintedanib

$295.00 25 mg

In Stock

CAS No.

Mol F.

: C30H30N6O5

Mol W.

: 554.6

Cat No.

: SA22529

Impurities, Nitrosamine, Sumatriptan

N-Nitroso–N-desmethyl sumatriptan

$155.00 10 mg

In Stock

CAS No.

: 3036581-86-6

Mol F.

: C13H18N4O3S

Mol W.

: 310.37

Cat No.

: SA34818

Piperidine

N-Nitrosopiperidine

$355.00 1 g

In Stock

CAS No.

: 100-75-4

Mol F.

: C5H10N2O

Mol W.

: 114.15

Cat No.

: SA49301

Pyrrolidine

N-Nitrosopyrrolidine

$125.00 100 mg

In Stock

CAS No.

: 930-55-2

Mol F.

: C4H8N2O

Mol W.

: 100.12

Cat No.

: SA49401

Donepezil, Impurities

N-Oxide Donepezil impurity

Please enquire for price & pack size

In Stock

CAS No.

: 120013-84-5

Mol F.

: C24H29NO4

Mol W.

: 395.49

Cat No.

: SA34301

Efavirenz, Impurities

N-p-methoxypheny Efavirenz

Please enquire for price & pack size

In Stock

CAS No.

: 174819-21-7

Mol F.

: C22H17ClF3NO3

Mol W.

: 435.82

Cat No.

: SA17606

Atorvastatin, Impurities

N-Phenyl Isobutyrylacetamide

$80.00 25 mg

In Stock

CAS No.

: 124401-38-3

Mol F.

: C12H15NO2

Mol W.

: 205.26

Cat No.

: SA17807

Cefadroxil, Impurities

N-Phenyl(Glycyl) delta-3-Cefadroxil

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C26H25F3N4O9S

Mol W.

: 626.56

Cat No.

: SA42311

Impurities, Isavuconazole

N-tert-Butyl Formyl Isavuconazonium Iodide Salt

Please enquire for price & pack size

In Stock

CAS No.

: 2169911-50-4

Mol F.

: C40H43F2N8O7S

Mol W.

: 817.88

Cat No.

: SA44105

Diltiazem

N,N-Didesmethyl Diltiazem

$255.00 25 mg

In Stock

CAS No.

: 115973-28-9 (Free base); 116050-35-2 (HCl Salt)

Mol F.

: C20H22N2O4S

Mol W.

: 386.47

Cat No.

: SA19518

Impurities, Ranitidine

N,N-Dimethyl-5-[[[2-[[1-(methylthio)-2-nitroethenyl]amino]ethyl]thio]methyl]-2-furanmethanamine

Please enquire for price & pack size

In Stock

CAS No.

: 72115-14-1

Mol F.

: C13H21N3O3S2

Mol W.

: 331.45

Cat No.

: SA26512

Diltiazem, Impurities

N,N,O-Tri-Desmethyl Desacetyl Diltiazem

$255.00 25 mg

In Stock

CAS No.

: 115992-91-1

Mol F.

: C17H18N2O3S

Mol W.

: 330.4

Cat No.

: SA19504

Rivaroxaban

N,N’-bis[4-(3- oxo-4- morpholinyl) phenyl]Urea

$95.00 25 mg

In Stock

CAS No.

: 1855920-51-2

Mol F.

: C21H22N4O5

Mol W.

: 410.42

Cat No.

: SA18623

Impurities, Ranitidine

N,N’-Dimethyl-2-nitro-1,1-ethenediamine

Please enquire for price & pack size

In Stock

CAS No.

: 54252-45-8

Mol F.

: C4H9N3O2

Mol W.

: 131.13

Cat No.

: SA26513

Impurities, Ticagrelor

N,O-Dialkylated Ticagrelor impurity

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C16H27NO7

Mol W.

: 345.39

Cat No.

: SA32523

Edoxaban, Impurities

N1,N2-bis(5-chloropyridin-2-yl)oxalamide

Please enquire for price & pack size

In Stock

CAS No.

: 349125-14-0

Mol F.

: C12H8Cl2N4O2

Mol W.

: 311.12

Cat No.

: SA33038

Ibrutinib

N6-Acryloyl Ibrutinib

Please enquire for price & pack size

In Stock

CAS No.

: 2031255-27-1

Mol F.

: C28H26N6O3

Mol W.

: 494.54

Cat No.

: SA47414

Impurities, Naloxone

Naloxone N-Oxide

Please enquire for price & pack size

In Stock

CAS No.

: 112242-14-5

Mol F.

: C19H21NO5

Mol W.

: 343.37

Cat No.

: SA45110

Propranolol

Naphthalene

$99.00 1 g

In Stock

CAS No.

: 91-20-3

Mol F.

: C10H8

Mol W.

: 128.17

Cat No.

: SA24613

Naproxen

$195.00 1 g

In Stock

CAS No.

: 22204-53-1

Mol F.

: C14H14O3

Mol W.

: 230.26

Cat No.

: SA20400

Naproxen

Naproxen EP Impurity B

$95.00 25 mg

In Stock

CAS No.

: 89617-86-7

Mol F.

: C14H13ClO3

Mol W.

: 264.7

Cat No.

: SA20417

Naproxen

Naproxen EP Impurity C

$125.00 25 mg

In Stock

CAS No.

: 84236-26-0

Mol F.

: C14H13BrO3

Mol W.

: 309.16

Cat No.

: SA20413

Impurities, Naproxen

Naproxen EP Impurity D

$125.00 25 mg

In Stock

CAS No.

: 116883-62-6

Mol F.

: C14H13IO3

Mol W.

: 356.15

Cat No.

: SA20416

Naproxen

Naproxen EP Impurity E

$75.00 25 mg

In Stock

CAS No.

: 26159-35-3

Mol F.

: C₁₅H₁₆O₃

Mol W.

: 244.29

Cat No.

: SA20402