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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, 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

Impurities, 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

Impurities, Neomycin

Neomycin sulfate EP Impurity D

Please enquire for price & pack size

In Stock

CAS No.

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

Impurities, Nintedanib

Nintedanib Desmethyl

$98.00 25 mg

In Stock

CAS No.

Mol F.

: C13H20N4O

Mol W.

: 248.32

Cat No.

: SA22501

Impurities, Nintedanib

Nintedanib dimer

$185.00 25 mg

In Stock

CAS No.

: 2410284-89-6

Mol F.

: C22H30N6O2

Mol W.

: 410.51

Cat No.

: SA22500

Impurities, Nintedanib

Nintedanib N-Acetyl Aniline Analog

$95.00 25 mg

In Stock

CAS No.

: 1139458-48-2

Mol F.

: C26H23N3O4

Mol W.

: 441.48

Cat No.

: SA22511

Impurities, Nintedanib

Nintedanib N-Methyl Aniline Analog

$185.00 25 mg

In Stock

CAS No.

: 1987887-92-2

Mol F.

: C24H21N3O3

Mol W.

: 399.44

Cat No.

: SA22510

Impurities, Nintedanib

Nintedanib N-Methyl Impurity

$345.00 25 mg

In Stock

CAS No.

Mol F.

: C32H35N5O4

Mol W.

: 553.65

Cat No.

: SA22509

Impurities, Nintedanib

Nintedanib Nitroso Impurity 2

Please enquire for price & pack size

In Stock

CAS No.

: 2490403-92-2

Mol F.

: C13H17N5O4

Mol W.

: 307.3

Cat No.

: SA22532

Impurities, Nintedanib

Nintedanib Piperazinyl N,N’-Dioxide

$185.00 25 mg

In Stock

CAS No.

: 2734676-68-5

Mol F.

: C31H33N5O6

Mol W.

: 571.62

Cat No.

: SA22504

Impurities, Nitrosamine

Nitrosamine impurity for Formoterol fumarate dihydrate

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C19H23N3O5

Mol W.

: 273.41000000000003

Cat No.

: SA44611

Impurities, Nizatidine

Nizatidine EP Impurity C; Nizatidine Sulfoxide

Please enquire for price & pack size

In Stock

CAS No.

: 102273-13-2

Mol F.

: C12H21N5O3S2

Mol W.

: 347.46

Cat No.

: SA34403

Impurities, Nizatidine

Nizatidine EP Impurity E

Please enquire for price & pack size

In Stock

CAS No.

: 188666-11-7

Mol F.

: C11H18N4O3S2

Mol W.

: 318.42

Cat No.

: SA34405

Impurities, Nizatidine

Nizatidine EP Impurity H

Please enquire for price & pack size

In Stock

CAS No.

: 27366-72-9(HClsalt);27507-28-4(Base)

Mol F.

: C4H10N2S. HCl

Mol W.

: 154.66

Cat No.

: SA34408

Impurities, Nizatidine

Nizatidine EP Impurity J

Please enquire for price & pack size

In Stock

CAS No.

: 78441-69-7

Mol F.

: C7H12N2OS

Mol W.

: 172.25

Cat No.

: SA34410

Impurities, Nizatidine

Nizatidine Impurity 1

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C12H20N4O2S3

Mol W.

: 348.52

Cat No.

: SA34416

Impurities, Norethindrone

Norethindrone Acetate EP Impurity E; 17-Desethynyl Norethindrone Diacetate

Please enquire for price & pack size

In Stock

CAS No.

: 66964-58-7

Mol F.

: C22H30O4

Mol W.

: 358.47

Cat No.

: SA13426

Impurities, Norethindrone

Norethindrone Acetate Impurity G; 6-Keto-Norethindrone Acetate

Please enquire for price & pack size

In Stock

CAS No.

: 438244-27-0

Mol F.

: C22H26O4

Mol W.

: 354.44

Cat No.

: SA13405

Impurities, Norethindrone

Norethindrone Diol 17-Acetate Impurity

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C22H30O3

Mol W.

: 342.47

Cat No.

: SA13439

Impurities, Norethindrone

Norethindrone EP Impurity A; 6,7-Dehydro Norethindrone

Please enquire for price & pack size

In Stock

CAS No.

: 31528-46-8

Mol F.

: C20H24O2

Mol W.

: 296.4

Cat No.

: SA13408

Impurities, Norethindrone

Norethindrone EP Impurity B

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C18H24O2

Mol W.

: 272.38

Cat No.

: SA13422

Impurities, Norethindrone

Norethindrone EP Impurity G

Please enquire for price & pack size

In Stock

CAS No.

: 38673-36-8

Mol F.

: C20H26O2

Mol W.

: 298.42

Cat No.

: SA13409

Impurities, Norethindrone

Norethindrone EP Impurity H; 6β-Hydroxy Norethindrone

Please enquire for price & pack size

In Stock

CAS No.

: 51724-44-8

Mol F.

: C20H26O3

Mol W.

: 314.42

Cat No.

: SA13412

Impurities, Norethindrone

Norethindrone Impurity E

Please enquire for price & pack size

In Stock

CAS No.

: 79727-03-0

Mol F.

: C22H26O

Mol W.

: 306.4

Cat No.

: SA13410

Impurities, Norethindrone

Norethisterone Acetate Impurity H; Norethindrone Acetate 3-Isopropoxy Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 2417092-17-0

Mol F.

: C25H34O3

Mol W.

: 382.54

Cat No.

: SA13416

Impurities, Norethindrone

Norethisterone Acetate Impurity I; Norethindrone Acetate 3-Ethyl Ether

Please enquire for price & pack size

In Stock

CAS No.

: 50717-99-2

Mol F.

: C24H32O3

Mol W.

: 368.51

Cat No.

: SA13427

Impurities, Norphenylphrine

Norphenylphrine HCl

Please enquire for price & pack size

In Stock

CAS No.

: 4779-94-6

Mol F.

: C8H12ClNO2

Mol W.

: 189.64

Cat No.

: SA20101

Impurities, Nortropine

Nortropine Benzilic Acid

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C14H12O3

Mol W.

: 228.24

Cat No.

: SA46601

Impurities, Ursodiol

Nutriacholic Acid

Please enquire for price & pack size

In Stock

CAS No.

: 4651-67-6

Mol F.

: C₂₄H₃₈O₄

Mol W.

: 390.56

Cat No.

: SA31206

Bupropion, Impurities

o-Bupropion; 3-Deschloro-2-chloro Bupropion

$125.00 25 mg

In Stock

CAS No.

: 1049974-40-4; 1049718-57-1

Mol F.

: C13H19Cl2NO

Mol W.

: 239.74

Cat No.

: SA12217

Dapagliflozin, Impurities

O-Desethyl Dapagliflozin

$186.00 10 mg

In Stock

CAS No.

: 864070-37-1

Mol F.

: C19H21ClO6

Mol W.

: 380.82

Cat No.

: SA15009

Bosentan, Impurities

O-Deshydroxyethyl Bosentan

Please enquire for price & pack size

In Stock

CAS No.

: 174227-14-6

Mol F.

: C₂₅H₂₅N₅O₅S

Mol W.

: 507.56

Cat No.

: SA28602