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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, Rivaroxaban

N-Nitroso Rivaroxaban Impurity B

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In Stock

CAS No.

Mol F.

: C19H19ClN4O7S

Mol W.

: 482.89

Cat No.

: SA18630

Impurities, Rivaroxaban

N-Nitroso Rivaroxaban Impurity G

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In Stock

CAS No.

Mol F.

: C18H19ClN4O5S

Mol W.

: 438.89

Cat No.

: SA18631

Impurities, Salmeterol

N-Nitroso Salmeterol

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In Stock

CAS No.

: 3036581-81-1

Mol F.

: C25H36N2O5

Mol W.

: 444.56

Cat No.

: SA10111

Impurities, Nitrosamine

N-Nitroso Sildenafil

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In Stock

CAS No.

Mol F.

: C22H29N7O5S

Mol W.

: 503.57

Cat No.

: SA44699

Impurities, Nitrosamine

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

Impurities, Nitrosamine

N-Nitroso Terbinafine EP Impurity A

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In Stock

CAS No.

: 296760-88-8

Mol F.

: C12H12N2O

Mol W.

: 200.2

Cat No.

: SA44621

Impurities, Trimetazidine

N-Nitroso Trimetazidine

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In Stock

CAS No.

: 92432-50-3

Mol F.

: C14H21N3O4

Mol W.

: 295.33

Cat No.

: SA35114

Impurities, Venlafaxine

N-Nitroso Venlafaxine Impurity E

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In Stock

CAS No.

Mol F.

: C16H22N2O3

Mol W.

: 290.36

Cat No.

: SA22739

Impurities, Venlafaxine

N-Nitroso Venlafaxine Impurity F

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CAS No.

Mol F.

: C16H22N2O2

Mol W.

: 274.36

Cat No.

: SA22738

Impurities, Venlafaxine

N-Nitroso Venlafaxine Impurity H

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In Stock

CAS No.

Mol F.

: C24H32N2O4

Mol W.

: 412.52

Cat No.

: SA22740

Impurities, Nitrosamine

N-Nitroso Vildagliptin

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In Stock

CAS No.

Mol F.

: C17H24N4O3

Mol W.

: 332.4

Cat No.

: SA23921

Impurities, Nitrosamine

N-Nitroso-Ambroxol

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In Stock

CAS No.

: NA

Mol F.

: C13H17Br2N3O2

Mol W.

: 407.1

Cat No.

: SA44676

Impurities, Nitrosamine

N-Nitroso-Atomoxetine

$155.00 25 mg

In Stock

CAS No.

Mol F.

: C17H20N2O2

Mol W.

: 284.4

Cat No.

: SA22123

Impurities, Nitrosamine

N-Nitroso-Bisoprolol

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In Stock

CAS No.

Mol F.

: C18H30N2O5

Mol W.

: 354.4

Cat No.

: SA35619

Impurities, Zolmitriptan

N-Nitroso-N-Desmethyl Zolmitriptan

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In Stock

CAS No.

: NA

Mol F.

: C15H18N4O3

Mol W.

: 302.33

Cat No.

: SA11908

Impurities, Nintedanib

N-Nitroso-N-Desmethylnintedanib

$295.00 25 mg

In Stock

CAS No.

Mol F.

: C30H30N6O5

Mol W.

: 554.6

Cat No.

: SA22529

Impurities, Nitrosamine

N-Nitroso-N-Ethyl piperazine

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In Stock

CAS No.

: 65504-33-8

Mol F.

: C6H13N3O

Mol W.

: 143.2

Cat No.

: SA44666

Impurities, Nitrosamine

N-Nitroso-Nebivolol

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In Stock

CAS No.

: 1391051-68-5

Mol F.

: C22H24F2N2O5

Mol W.

: 434.4

Cat No.

: SA14710

Impurities, Nitrosamine

N-Nitroso-salbutamol

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In Stock

CAS No.

: 2919946-71-5

Mol F.

: C13H20N2O4

Mol W.

: 268.31

Cat No.

: SA26019

Impurities, Sumatriptan

N-Nitroso–N-desmethyl sumatriptan

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In Stock

CAS No.

: 3036581-86-6

Mol F.

: C13H18N4O3S

Mol W.

: 310.37

Cat No.

: SA34818

Impurities, Nitrosamine

N-Nitrosodimethylamine

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In Stock

CAS No.

: 62-75-9

Mol F.

: C2H6N2O

Mol W.

: 74.08

Cat No.

: SA44601

Impurities, Nitrosamine

N-Nitrosofluoxetine

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In Stock

CAS No.

: 150494-06-7

Mol F.

: C17H17F3N2O2

Mol W.

: 338.33

Cat No.

: SA44639

Impurities, Piperidine

N-Nitrosopiperidine

Please enquire for price & pack size

In Stock

CAS No.

: 100-75-4

Mol F.

: C5H10N2O

Mol W.

: 114.15

Cat No.

: SA49301

Impurities, Pyrrolidine

N-Nitrosopyrrolidine

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In Stock

CAS No.

: 930-55-2

Mol F.

: C4H8N2O

Mol W.

: 100.12

Cat No.

: SA49401

Donepezil, Impurities

N-Oxide Donepezil impurity

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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, Impurities

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

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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

Impurities, Rivaroxaban

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

$150.00 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, Nitrosamine

N,N’-Dinitrosopiperazine

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In Stock

CAS No.

: 140-79-4

Mol F.

: C4H8N4O2

Mol W.

: 144.13

Cat No.

: SA446103

Impurities, Ticagrelor

N,O-Dialkylated Ticagrelor impurity

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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, Impurities

N6-Acryloyl Ibrutinib

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In Stock

CAS No.

: 2031255-27-1

Mol F.

: C28H26N6O3

Mol W.

: 494.54

Cat No.

: SA47414

Impurities, Naloxone

Naloxone N-Oxide

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In Stock

CAS No.

: 112242-14-5

Mol F.

: C19H21NO5

Mol W.

: 343.37

Cat No.

: SA45110

Impurities, Propranolol

Naphthalene

Please enquire for price & pack size

In Stock

CAS No.

: 91-20-3

Mol F.

: C10H8

Mol W.

: 128.17

Cat No.

: SA24613

Impurities, Naproxen

Naproxen

Please enquire for price & pack size

In Stock

CAS No.

: 22204-53-1

Mol F.

: C14H14O3

Mol W.

: 230.26

Cat No.

: SA20400

Impurities, Naproxen

Naproxen EP Impurity B

$155.00 25 mg

In Stock

CAS No.

: 89617-86-7

Mol F.

: C14H13ClO3

Mol W.

: 264.7

Cat No.

: SA20417

Impurities, Naproxen

Naproxen EP Impurity C

$155.00 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

Impurities, 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

Impurities, Naproxen

Naproxen EP Impurity F

$75.00 25 mg

In Stock

CAS No.

: 31220-35-6

Mol F.

: C16H18O3

Mol W.

: 258.31

Cat No.

: SA20403

Impurities, Naproxen

Naproxen EP Impurity G

Please enquire for price & pack size

In Stock

CAS No.

: 23979-41-1

Mol F.

: C14H14O3

Mol W.

: 230.3

Cat No.

: SA20418

Impurities, Naproxen

Naproxen EP Impurity H

$75.00 25 mg

In Stock

CAS No.

: 5111-66-0

Mol F.

: C11H10O2

Mol W.

: 174.2

Cat No.

: SA20412

Impurities, Naproxen

Naproxen EP Impurity I

$95.00 25 mg

In Stock

CAS No.

: 23981-47-7

Mol F.

: C13H12O3

Mol W.

: 216.23

Cat No.

: SA20404

Impurities, Naproxen

Naproxen EP Impurity K

$95.00 25 mg

In Stock

CAS No.

: 77301-42-9

Mol F.

: C13H14O2

Mol W.

: 202.25

Cat No.

: SA20405