Home / Products / Impurities

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.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Impurities, Nitrosamine

N-Nitrosofluoxetine

Please enquire for price & pack size

In Stock

CAS No.

: 150494-06-7

Mol F.

: C17H17F3N2O2

Mol W.

: 338.33

Cat No.

: SA44639

Impurities, Nitrosamine, 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, Nitrosamine, Pyrrolidine

N-Nitrosopyrrolidine

Please enquire for price & pack size

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, 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

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

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

Please enquire for price & pack size

In Stock

CAS No.

: 140-79-4

Mol F.

: C4H8N4O2

Mol W.

: 144.13

Cat No.

: SA446103

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, Impurities

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

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

Impurities, Naproxen

Naproxen EP Impurity L

$75.00 25 mg

In Stock

CAS No.

: 3900-45-6

Mol F.

: C13H12O2

Mol W.

: 200.23

Cat No.

: SA20406

Impurities, Naproxen

Naproxen EP Impurity M

$75.00 25 mg

In Stock

CAS No.

: 93-04-9

Mol F.

: C10H7OCH3

Mol W.

: 158.2

Cat No.

: SA20407

Impurities, Naproxen

Naproxen EP Impurity N

$75.00 25 mg

In Stock

CAS No.

: 5111-65-9

Mol F.

: C11H9BrO

Mol W.

: 237.09

Cat No.

: SA20408

Impurities, Naratriptan

Naratriptan Impurity A

$150.00 25 mg

In Stock

CAS No.

: 17403-07-5; 1956385-76-4

Mol F.

: C₁₄H₁₈N₂

Mol W.

: 214.31

Cat No.

: SA30801

Impurities, Naratriptan

Naratriptan Impurity B

$150.00 25 mg

In Stock

CAS No.

: 121679-20-7; 121679-21-8

Mol F.

: C17H23N3O2S

Mol W.

: 333.45

Cat No.

: SA30802

Impurities, Naratriptan

Naratriptan N-Oxide

Please enquire for price & pack size

In Stock

CAS No.

: 1159977-52-2

Mol F.

: C₁₇H₂₅N₃O₃S

Mol W.

: 351.46

Cat No.

: SA30807

Impurities, Nebivolol

Nebivolol Epoxide A

Please enquire for price & pack size

In Stock

CAS No.

: 793669-26-8

Mol F.

: C11H11FO2

Mol W.

: 194.2

Cat No.

: SA14708

Impurities, Nebivolol

Nebivolol Epoxide B

Please enquire for price & pack size

In Stock

CAS No.

: 876514-31-7

Mol F.

: C11H11FO2

Mol W.

: 194.2

Cat No.

: SA14709

Neomycin

Neomycin Sulfate EP Impurity A

Please enquire for price & pack size

In Stock

CAS No.

: 15446-43-2

Mol F.

: C12H30Cl4N4O6

Mol W.

: 468.2

Cat No.

: SA51402

Neomycin

Neomycin sulfate EP Impurity D

Please enquire for price & pack size

In Stock

CAS No.

: 18685-97-7

Mol F.

: C12H25N3O7

Mol W.

: 323.34

Cat No.

: SA51404

Impurities, Neostigmine

Neostigmine EP Impurity A

Please enquire for price & pack size

In Stock

CAS No.

: 2498-27-3

Mol F.

: C9H14INO

Mol W.

: 279.12

Cat No.

: SA19702

Impurities, Nicotine

Nicotine EP Impurity A

Please enquire for price & pack size

In Stock

CAS No.

: 581-49-7

Mol F.

: C10H12N2

Mol W.

: 160.22

Cat No.

: SA32201

Impurities, Nicotine

Nicotine EP Impurity B

Please enquire for price & pack size

In Stock

CAS No.

: 487-19-4

Mol F.

: C10H10N2

Mol W.

: 158.2

Cat No.

: SA32202

Impurities, Nicotine

Nicotine EP Impurity C

Please enquire for price & pack size

In Stock

CAS No.

: 486-56-6

Mol F.

: C10H12N2O

Mol W.

: 176.22

Cat No.

: SA32203

Impurities, Nicotine

Nicotine EP Impurity D

Please enquire for price & pack size

In Stock

CAS No.

: 532-12-7

Mol F.

: C9H10N2

Mol W.

: 146.19

Cat No.

: SA32204

Impurities, Nicotine

Nicotine EP Impurity E

Please enquire for price & pack size

In Stock

CAS No.

: 63551-14-4

Mol F.

: C10H14N2O

Mol W.

: 178.23

Cat No.

: SA32205

Impurities, Nicotine

Nicotine EP Impurity F

Please enquire for price & pack size

In Stock

CAS No.

: 494-97-3

Mol F.

: C9H12N2

Mol W.

: 148.2

Cat No.

: SA32206

Impurities, Nilotinib

Nilotinib Methyl Ester Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 917392-54-2

Mol F.

: C18H16N4O2

Mol W.

: 320.35

Cat No.

: SA40613

Impurities, Nintedanib

Nintedanib (E)-methyl 1-acetyl-3-(methoxy(phenyl)methylene)-2-oxoindoline-6-carboxylate

$180.00 50 mg

In Stock

CAS No.

: 1168152-07-5

Mol F.

: C20H17NO5

Mol W.

: 351.35

Cat No.

: SA22517

Impurities, Nintedanib

Nintedanib Acetamide Impurity; N-(4-aminophenyl)-2-(4-methylpiperazin-1-yl)acetamide

$175.00 50 mg

In Stock

CAS No.

: 262368-25-2

Mol F.

: C13H20N4O

Mol W.

: 248.32

Cat No.

: SA22518

Impurities, Nintedanib

Nintedanib Carboxylic Acid

Please enquire for price & pack size

In Stock

CAS No.

: 894783-71-2

Mol F.

: C30H31N5O4

Mol W.

: 525.6

Cat No.

: SA22505