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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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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, Nitrosamine

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

Formoterol, 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

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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

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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

Impurities, Venlafaxine

O-Desmethyl Venlafaxine Cyclic Impurity

$295.00 25 mg

In Stock

CAS No.

: 1346601-55-5

Mol F.

: C16H23NO2

Mol W.

: 261.36

Cat No.

: SA22726

Impurities, Sofosbuvir

O-Desphenyl O-methyl Sofosbuvir

$495.00 25 mg

In Stock

CAS No.

Mol F.

: C17H27FN3O9P

Mol W.

: 4667.38

Cat No.

: SA15439

Impurities, Sofosbuvir

O-Desphenyl sofosbuvir; Sofosbuvir O-Desphenyl Impurity

$255.00 10 mg

In Stock

CAS No.

: 1233335-82-4

Mol F.

: C16H25FN3O9P

Mol W.

: 453.36

Cat No.

: SA15404

Dolutegravir, Impurities

O-Methyl Dolutegravir Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 1335210-35-9

Mol F.

: C21H21F2N3O5

Mol W.

: 433.41

Cat No.

: SA20228

Dapagliflozin, Impurities

O-Pentaacetyl O-Desethyl Dapagliflozin; Pentaacetyl Dapagliflozin

$217.00 25 mg

In Stock

CAS No.

Mol F.

: C29H31ClO11

Mol W.

: 591

Cat No.

: SA15022

Impurities, Irganox

Octadecyl 3-(3-tert-butyl-4-hydroxyphenyl)propanoate

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C31H54O3

Mol W.

: 474.41

Cat No.

: SA11102

Impurities, Irganox

Octadecyl-4-hydroxyphenylpropionate

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C27H46O3

Mol W.

: 418.65

Cat No.

: SA11103

Impurities, Olmesartan Medoxomil

Olmesartan Alkene N1-Trityl Impurity

$295.00 25 mg

In Stock

CAS No.

Mol F.

: C48H42N6O5

Mol W.

: 782.88

Cat No.

: SA17710

Impurities, Olmesartan Medoxomil

Olmesartan dimer impurity

$495.00 25 mg

In Stock

CAS No.

: 1454571-97-1

Mol F.

: C53H54N12O9

Mol W.

: 1002.41

Cat No.

: SA17706

Impurities, Olmesartan Medoxomil

Olmesartan EP imp A

$80.00 25 mg

In Stock

CAS No.

: 144689-24-7

Mol F.

: C24H26N6O3

Mol W.

: 446.5

Cat No.

: SA17713

Impurities, Olmesartan Medoxomil

Olmesartan EP imp B

$85.00 25 mg

In Stock

CAS No.

: 849206-43-5

Mol F.

: C24H24N6O2

Mol W.

: 428.49

Cat No.

: SA17714

Impurities, Olmesartan Medoxomil

Olmesartan EP imp C

$155.00 25 mg

In Stock

CAS No.

: 879562-26-2

Mol F.

: C29H28N6O5

Mol W.

: 540.21

Cat No.

: SA17715

Impurities, Olmesartan Medoxomil

Olmesartan EP imp D

$95.00 25 mg

In Stock

CAS No.

: 1020157-01-0

Mol F.

: C48H44N6O6

Mol W.

: 800.9

Cat No.

: SA17716

Impurities, Olmesartan Medoxomil

Olmesartan Ethyl Ester

$125.00 25 mg

In Stock

CAS No.

: 144689-23-6

Mol F.

: C27H31N5O3

Mol W.

: 473.57

Cat No.

: SA17719

Impurities, Olmesartan Medoxomil

Olmesartan ethyl ester N-1 trityl analog

$125.00 25 mg

In Stock

CAS No.

: 189400-21-3

Mol F.

: C45H44N6O3

Mol W.

: 716.87

Cat No.

: SA17717

Impurities, Olmesartan Medoxomil

Olmesartan ethyl methyl N2-trityl ethyl ester analouge

$295.00 25 mg

In Stock

CAS No.

Mol F.

: C46H46N6O3

Mol W.

: 730.9

Cat No.

: SA17721

Impurities, Olmesartan Medoxomil

Olmesartan Medoxomil

Please enquire for price & pack size

In Stock

CAS No.

: 144689-63-4

Mol F.

: C29H30N6O6

Mol W.

: 558.59

Cat No.

: SA17730

Impurities, Olmesartan Medoxomil

Olmesartan Medoxomil Impurity 4

$295.00 25 mg

In Stock

CAS No.

: 95579-71-8

Mol F.

: C5H5ClO3

Mol W.

: 148.544

Cat No.

: SA17704

Impurities, Olmesartan Medoxomil

Olmesartan Trityl Alcohol impurity

$75.00 25 mg

In Stock

CAS No.

: 76-84-6

Mol F.

: C19H16O

Mol W.

: 260.33

Cat No.

: SA17720

Impurities, Olmesartan Medoxomil

Olmesartan trityl Dimer

$255.00 25 mg

In Stock

CAS No.

: 1454571-98-2

Mol F.

: C91H82N12O9

Mol W.

: 1487.7

Cat No.

: SA17705

Impurities, Omeprazole

Omeprazole EP Impurity B

Please enquire for price & pack size

In Stock

CAS No.

: 110374-16-8

Mol F.

: C16H17N3O2S

Mol W.

: 315.39

Cat No.

: SA19408